How cold should my air conditioning Be?
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- Опубликовано: 6 июн 2024
- explaining the the difference between return temperature and supply temperature.. how to tell if your air conditioning is working properly.
Thanks for watching!
- David
David@DavidJonesAC.com
Follow me on Facebook: / david-jones-ac-1010702...
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I've found my infrared to be very accurate despite all the negative "professionals". AC is set at 78°. Returns show 78° to 79°, which is located on the wall even with the ceiling. My registers, on the floor, throughout the house, show 58° to 61°. About 17° to 21° difference with my 40 to 50 year old HVAC. I've always done alot of preventive maintenance on everything. Good video! Thanks!
This was an outstanding video your clear concise everything you said makes sense I just don't know how to tell you how much I really appreciate what you taught me in 15 minutes that I listen to you have standing job the particularly I like your attitude so thank you very much
Love your videos very informative and to the point. Thanks
The true test is a across the evaporator. If it’s 18-20 and only 15 at supply grills it’s the duct work or a very hot attic with no ventilation. I am 100% sure this man knows this and is a truly awesome tech.
Thanks bud, the guy who installed mine was terrible, so I educated myself and reinstalled it myself, for example at the kill switch outside he had two black wires together so when I pulled it there was still power, then he didn't want to get into the crawl space to run thermostat wires so he put the thermostat at the end of the house right beside the furnace!!!!
Greg a probe style thermometer needs to be used in order to have an accurate air temperature measurement. the air at the face of the diffuser and the air just one inch behind the diffuser can be vastly different in temperature due to mixing after the diffuser.
In Texas inspectors look for 16 - 21 degree delta T. The air where you change your filter minus the supply air closest to where the unit sits.
Texas here, If I got a Delta of 13 which is lower than the 16-21 does that mean anything? Better? Worse?
Really enjoyed this video. :) Info is power!
Just a quick option, IR point and shoot temp. guns are for measuring surfaces temperature such as a motor bearing, over heating electrical circuit, and so on. They are not designed to measure air temperature. In your example your are not measuring air temp. but the surface of the devises the air is blowing over which can be drastically different than the actual air temperature which is the correct measurement to establish delta "T". ( Air temp. in - air temp. out = Delta" T " )
Nice video this is what I FREAKING NEEEEEEDDDD!!!
Thank U for videos. Very thorough!
Hey David love your videos! Quick question, how would you go about adding another return from the master bedroom back to an air handler that is installed in a closet in the hallway? It has very little room to the sides as the return has a grill right below the half-door. I think my only option is to run a jumper duct from the bedroom back into the hallway. Is this what you would do?
Thanks, very helpful
I hope it help.thanks
Nice to see you are posting videos again! If I mask ask, how long should the system be running before taking the Delta T measurement? Thanks.
Thanks
Have a 410A system with a current 16F drop from 74F to 58F with 85F outdoors and high humidity--tested at the coldest outlet nearest the evap (But it is an attic based handler with ceiling outlets.) Seems a little weak to me but OK. Our old R22 system could take a hot house and cool it down to 72F within about an hour and of course shut off. This system runs well beyond 1.5 hours. Seems like the age old story: They don't make em like they used to.
Might want to check your blower fan speed. Depending on seer rating wanted we sometimes use a 5 ton air handler with a 4 ton heat pump. Gets us to 15 seer instead of 14. If they didnt change the blower speed it could be to high.
Question David; Old 2nd floor unit blowing about 77 at the register, 1st floor unit blows at 55 degrees...yesterday the 2nd floor unit was replaced with new (Goodman) condenser unit outside and new coil in the attic... ($3200)...today, 1st floor still around 55, new unit for 2nd floor STILL blowing at around 77 at the register...this does not appear normal to me. I'm now on the hook for $3200 and there's no difference? any suggestions will be apprecated...
just wondering how many feet are you supposed to be when you're testing the air flow coming out and do you have an example of how fast the air should be coming out?
Checked mine with the same sensor you have there, this unit is 31 years old, Whirlpool installed by Sears and has a diff reading of approx. 16-17 degrees diif. Never been worked on by a tech. Yet. Haa, was told by HVAC service Companies that some of the old vintage units run forever. Almost there, haaa.
That will tell you only now cool it is at surface measured. Outside temperature has huge effect which is why two phase are popular in really hot climates. They cool more without the cost of too large a unit from short cycling.
good one thanks
Glad it helped
Your welcome
This does help, my ac is 7 years old and I just sometimes feel it's not cooling like it was, I checked mine 68 intake 54 at 3 major vents tops so that's 14, I have cleaned my condenser coils and checked my run capacitor. All seems well, I unfortunately only have gauges for automotive use so I cant check the charge, I almost never let my filter get dirty, they auto deliver them every 3 months, no pets etc and I'm pulling very mildly dirty ones out on each change. I am going to recheck this at the hottest point of the day and see how much of a drop I get. The laser gun is the cheapest most useful tool you can have. I use mine to gauge thermostats to see if they open at the right temperature and to verify sending units are reading right and cooling fans coming on and such.
Do you have to have a license to get the proper refrigerant for home AC? I'm a good DIY type, and I dont mean "home improvement" goofs ha!
"Only EPA-certified technicians are allowed to purchase ozone-depleting substances (ODS) used as refrigerants." You can get initial purchasing/handling certification with an online class. The initial certification has some restrictions. You are supposed to buy only one pound cans and supposed to work on small systems like ac window units and refrigerators. But, the basic principals of smaller systems apply to the larger systems.
If inside home temperature is higher would it effect the system pressures at the condenser outside?
thank you sir
It's for accurate delta t and return plenum and supply plenum
good info!! thanks for sharing
Between 14-18 split..
Out of register 57-60 degree
Mine is 50-54 degree out of register, 72-74 at the return. Is 4 ton too big to cooling a living area of 1,600 sq ft? I lives in Florida in an older home.
Thank you
IR gun is good if you understand and avoid IR reflections. Aluminum is a good IR reflector. Other items in the environment, like your body heat, can reflect off the surface into the gun raising the temp reading on the IR gun higher than the actual surface you trying to measure.
Most common mistake is pointing an IR gun at a foil thermal barrier. You will not be measuring temp coming through thermal barrier. You will get the average temperature of the room and objects in the room reflecting from the barrier surface.
what was the air temp outside during this and what size house and unit size
If the unit is overcharged you will lose cooling, And the higher the differential of supply to return means the unit could be oversized for the Zone, and will satisfy the thermostat before it removes the humidity from the zone , And you will have a cool clammy air !
Hello I have a window AC how cool do they get? I am assuming they won't drop below 80 degrees on a 90 degree day for example? I had a guest complain that it was cooler outdoors than indoors. My thought is well open up the windows! The window AC I know is limited on how much room it can cool and what the temperature will drop to do you have any knowledge on this you can share with me so I can educate my guests Maui, HI
What tool do you use? Can I buy it on amazon?
What infrared thermometer are u using ?
How do make it colder before freez. Up lower freon pressure or higher freon pressure does lowering the freon pressure make the evapoater colder to a certain point. Pleased respond.
Our ac doesnt seem to be blowing very cold.maintenence came and aimed a Thermometer in the vent and said it was 38 degrees the theromastat says it's 75 in the apartment plus it has got a little humid inside.im so aure i trust his decision saying everythinh is ok
a correct sized system should have a 45 degree fahrenheit coil temp and a 55 degree discharge temperature at the register
amen
Have you heard about using Cold Plus refrigerant additive to get colder air and use less electricity? I heard that both commercial and residential units are saving between 8% to 18% utility bill savings...is that possible?
That's what I thought until our utility company (XCEL) said they heard about it and are about to create a $400 per Kw rebate program for it. Too much data to behind this product to not be real. Just found this: www.hpac.com/blog/refrigerant-additives
It's 110 outside..what temp should my minisplit be pushing out the vent it's set to 60°
My upstairs is a lot harder than it is downstairs and I want to know if I can turn around and add a thermostat upstairs to divide my air-conditioning from the downstairs is there a way of doing that without having to buy a whole brand new air conditioner unit my home is just about a year and a half to two years old air conditioner in and heater is brand new and I had an air conditioning people come down and they wanted to sell me one for $3000 and I just don’t understand why do I have to buy a whole brand new air conditioner when I should be able to split it if it’s possible if there’s anything you can give me a hand with her any comments it would be appreciated thank you very much
Ty good video
THANX
Answer the Question. How cold should my air conditioning Be? What that means to a home owner is just what it says....! How cold SHOULD my air conditioning air be. The question asked is based on "actual conditions" for a properly installed, properly maintained, properly sized HVAC system. The air temp coming out of the vents "should" be "X" under the above mentioned conditions....What is X? BTW - Regardless of contrary opinions, Mr. Jones may be one of the most honest HVAC business men out there.
16-18 degrees difference
if your home air conditioning does not seem to be working? maybe this will help.
I thought those infrared thermometers gave you the temperature of the surface the red light was on and not the temperature of the air. Good video
It could read very differently from the actual air temperature as the grill surface and inside of the vent may be a different emissivity than the IR thermometer is calibrated for. I'd get a thermometer with a remote thermistor probe to compare the readings first before relying on the IR thermometer alone. If they're very close then it should be okay to use the IR to measure, which is much easier to use than putting a temperature probe in the grill.
I made a comparison on mine and the IR is pretty close, within a degree, so it's a good way to check.
DTR RTD I've done the same with the same results. The farther away you are, the infrared reads a 3 inch circle which is why they are indeed close.
You are correct
I have 21 degree drop all the time is that optimal
My supply & return difference is 5degrees. Supposeley they change compressor and expansion valve and still not cooling enough
Once I saw the infrared thermometer in his hand I had to cut the video off.
So true!
He said he has guys calling him from all over the united states lol. Do techs not go to college like i did??? That temp thing was semester 1 for me in college...in 1988. 30 to 35 temp diff between duct out and outdoor ambient...not complicated
Sorry dude. The delta T can change wildly depending on relative humidity. Overcharged? What's the SC & SC? Also, use an actual thermometer, not an ir surface type for actual temperatures.
How about that message at the end. Pay it forward. Nice.
How increase cold below 18degree in central aircondition
What does subcool mean?
Notes water, 10-12 degrees sub cool 18 degrees on fins
Won’t the difference between the supply and return temperature simply be a function of how cold you choose to set the thermostat?
For example, my supply temp is 60. That’s not going to change regardless if I choose to keep it 70 in my home or 78 in my home.
If I keep the temp indoors 70 degrees, the return temp will be 70,and the difference only 10 , but if I keep it 78 indoors, the return temp at 78 will have a differential of 18.
Am I missing something?
No the supply air will be colder at 70F setting if it is returning 70F air, if you run ac much below 68F you run the risk of freezing up the evaporator coil, because of low load.
plus it depends on how hot the outside temperature is, especially with the low grade insulated duct work in most houses , if return is in the attic its worse, attic 130 deg, R6 duct , not sure what rocket scientist was involved with that code, and same deal in the winter if you live in that climate.
Does this formula work for furnace also? should be between 15-20 delta?
No btu transfer is different for heating
I keep our thermostat on 79 degrees. I checked the air at the vent and it reads 74 degrees. The house does cool 79 but the unit is running to long I think to get there.
Lower thermostat to 76°F, and then check supply vent during cycling. Temp should be in low 60's or lower. The border is 77°F. Thermostat set above that gives you (73°F) warmer air at the air vent., on some units. If this is true for you, try setting thermostat at 77°F and leave it there.
I'm right at 18 degree difference.
This raises a topic of concern - but using an Infrared surface temp gun isn't an accurate measurement. Instead - consider inserting a dry bulb thermometer into the return and the supply, at the air handler and take the same measurements. Leave that gun in your tool bag. You'll also want to know more about duct leakage, wet bulb temp (air temp after taking into account for humidity), fan flow rate, outdoor temp - just to name a few.
oh brother. Id bet a oat load of cash that the infrared is within 1 degree. We are not splitting atoms here.
For a home owner.. to get a feel for his ACs performance, this is a descent start. There is so much fraud in the AC field.
I degree of what? ;) You've been drinking too much of that white creamy stuff - lactoseman
@@Milkman3572000 💯👍
Says 100° outside direct sun really is 90° now. I'm set at 76° it says 83° on display my vent air is feeling cold enough yet not as strong blowing I think. I need to buy temperature reader
With a temperature so hot depending on your insulation in your attic the AC system cannot keep up some of those hot three or four weeks out of the year thank you for watching
18-22 temp split is a good difference. 15 = issues in airflow or charge
@mark40511 Don't focus on the room or thermostat temperature for this particular test, except to lower the temp on the thermostat enough so that the air stays on for a while; but, yes, you have the right idea. The two temps you are looking at are as you have stated - the ones that will give you the DIFFERENCE. (i.e. supply and return). I'm absolutely horrible at explaining, so let me know if that doesn't make sense. :)
I have a 1990 vintage Heil 2.5t, R22 system that now is using 410a when R22 was banned. With the pressure differences of the two refrigerants, can this unit still be overcharged or undercharged? Reason why I'm asking is in high temp and outside humidity conditions my temp difference is about 12 to 14 degrees. But at night, I'll get a 19 to 22 degree difference. My average delivery temps are from 61 to 63 degrees daytime and 51 to 53 degrees at night. My evaporator coil is new, I installed it two years ago and pumped it down with a vacuum pump before charging it. Does it need more 410a, or do I have to recharge it with a different refrigerant?
How do you know which registers are supply and which are returns?
Supply vents usually have some means of adjustment, such as a lever, etc. Return vents rarely do.
I thought it was better from the actual unit itself vs the grill ceiling
Check return air from return plenum of the unit making sure to be as far away from the coil or blower as possible but able to catch all return branches and supply air should be a few feet down the supply trunk line to be accurate.
Don't you have to take at supply/return plenum? if not it's just a dog and pony show. This is also an a.c. tech trick to sale. Have to account hearload on ductwork
I had a new AC installed outside. With my old unit the humidity in the house would be between 42% - 49% during the summer. This new unit the humidity is between 56% to 63%. What could be wrong? The new unit drops the temp down but it runs longer and harder.
I got 70 in 62 out in master bedroom 60 in the rest of the house
My thermostat is in the living room and it always runs because temp gets up to 80 degrees but all other rooms are much cooler. cleaned blower wheel and evap coil. inside ac is 2.5 ton matching outside unit. return is 20x20 .house is 1,100 living space. all Windows have been changed double pain except sliding door in living room. attic is insulated. help please.
close down the supply and returns in the cool rooms and get a high airflow return cover in the living room.
Get a thermostat with a remote sensor. I have two remote sensors on my Honeywell plus read it at the thermostat. If the room in general is warmer than the bedrooms maybe consider added another duct.
You are actually to get your temperature split at the unit or air handler and never with an ir gun
He's using infarad and measuring surface temp. This is not accurate as you want air temp. A thermistor will give better results. Also the statement at the beginning of being over charged or under is an off the wall guess not even close to the only possible problems.
but you're probably only finding this video if you suspect you have an issue, in which case the A/C has probably been running for 2 hours already and doing nothing (or maybe a small something), in which case the surface temeperature of the metal will be pretty much exactly the same as the air temperature. And in any case if the A/C technician is using one of these themselves they will probably be more willing to listen to you if you can give them a 'DELTA T' and explain how you got it.
Delta T is measured across the evap coil. Not at the supply and return. R22 equipment is optimal between 15 and 20 degrees dt. R410a is 20 to 25 dt. If the temps are low it could be dirty coils or low on refrigerant and if the numbers are high it’s most likely poor air flow causing the coil to get colder.
Global Air services
@@andrewdarbyshire9108Low-speed air will make the air colder and the unit run longer if your unit needs longer running time for humidity. The customer might demand it satisfy the t-stat faster but longer running time gives better comfort. The lower airspeed will also put less load on the compressor and it should use less power. It all depends but I would not try to adjust the charge by the delta t. Most units actually need more airflow because they have long runs of old r4 flex. It has to run through the evaporator slow enough to give up the heat and fast enough that it doesn't pick up too much heat. It definitely has to deliver enough air to overcome the load and it all depends on where you live what humidity level is desirable.
@@andrewdarbyshire9108 hi, I been working on trane xr18? I forgot model, but it is a fairly large split condenser and in 73 weather it was only barely getting 15 degree drop, does that seem right? Can't get manager to answer me back on this, I am new tech
20 is overcharged!? Nope.
was this filmed using a fax machine?
2:35 seems to be holding an old ipad to film this :)
This using what name plz
LOL!!! Gotta love all these "pros" with their "not air temp" and "not a probe" comments. Bottom line is if you are getting 15 degrees difference reading surface temps at the registers with an infrared then you can be pretty certain the probe temps difference at the unit will be greater and all is good. You "experts" need to check your ego and realize this video is good for a layman to get a quick check on their own system... IMHO...
WRONGGG!!!! We don't look for surface temp, we look for air flow temp. And latent humidity levels. A thermometer in the duct is best. And a psychrometer or humidstat for humidity levels. Unless the equipment specs says 15 degree delta t is ok, then you may need to make further adjustment to get a wider temp difference.
@@smacleod69 The irony of your comments, that I am sure you will miss, is that you just made my point...
@@MiklaDfarNot ego Its Knowledge and years of experience. learn to appreciate it.
we were looking at a new home, during purchase home inspection, new ac in 2014, 2017 there was some type of leaking of the line, new line was replaced, now during the home inspection the ac running for several hours, how ever home air temps are about only 12 degrees difference max, temp max, the home wasn't that cool, it was set to 77 never achieved that in 2 hours? would you please advise?
either unit is undersized or leak not fixed low on 401
What’s the name of that tool please
Chrysanthus Okoro Infrared Thermometer
you residential guys.... you cant get an accurate temperature with that infrared temp gun that is measuring surface temp and looses accuracy quickly based on distance to the surface. Depending on what refrigerant you have in your system and what type of expansion device determines the split temps... 15-18 is a bit low
There's not enough information given to determine whether or not that split is low. Sometimes, an 11 degree Delta T is perfect.
Recording with temp prob is more accurate
If it’s under 20 it’s undercharged if it’s over it’s overcharged??? Especially in fla??? Sensible vs latent???? Airflow??? Wish it was that cut and dry
Love the message at the end though 👍🏻
Mine says -62 Fahrenheit
could you translate in English please what you said between 0.22 and 0.27
Thank you.
It say can be overcharged or undercharge 😎
@@renecuevas4128 which is which? I can't make out which goes with what.
55-58 farenheit
Let the system run about 1/2 hr.
Thank you sir!
This using what name plz
how they get this number? 15-20
Boyle's law and the Pythagorean theorem X your mom .
Adrián Izaguirre
Pretty funny Seth. Shows you don't know either LOL. Loser
I don't know how HE got his numbers but he is correct. Under "normal" operating conditions, if the superheat or sub-cooling temperatures are right then you should have a 15 to 20 degree temperature drop across the indoor coil (just don't use an infrared thermometer).
I do hvac in central Texas. On a hot summer day 90+ I usually see 17-21. In the "winter" when is 60-70 outside I've seen them as high as 25. Usually 20-23.
Any one can tell if there Air conditioning is working
Mr Jones, that infrared thermometer is measuring the surface temperature not the air temperature. If the system has been running for only a few minutes then the register or interior of the duct won't be very cold and even once it's run for a longer period that method won't be very accurate. ***** Jim Luke Justin Mikola Nicholas Rowan Larry Cole infrared is great for taking the temperature of a compressor, a poorly insulated ceiling, a condenser fan motor or blower motor but not air or am I way off?
You are exactly right but a lot of tech do it anyway
This industry needs to realize that speed kills! We need to be more precise, it's no wonder customers don't trust the industry in general when so many companies and technicians are simply trying to make as much money as they can as fast as they can. It's a shame, really!
Yes Stephen, it is a shame but the sad thing is the guy that taken the short cut thinks he is doing a good job.
You are correct. Delta T should be taken at the supply and return plenums. Ducts are insulated differently and located in different areas (crawls and attics) so vent temperature tells nothing of system performance. It will tell you how much heat you have gained from the air handler to the conditioned space though. I only use my infrared as a spot check for dew points and letting my daughter play with the laser.
That reads surface temp not air temp..need 18 degree split...over 20 to cold under 16 it want keep up
It gives good idea of how
Well your AC system is working
This is for homeowners thanks
The temp drop is measured at each end of the actual air handler with a thermometer stuck directly into the air flow. Throw that fancy IR thermometer in the trash! The IR Thermometer is NOT reading air temp, it is reading the surface temp of whatever the red dot is on. 🤦🏻♂️
Sean Geary actually the red dot is a laser and just for pointing. It has nothing to do with reading the temp. The IR has a cone shape reading and reads surface temp. You are correct that it should not be used for a temp drop. Thermometers in the air stream is the proper way.
I have guys call me from all over the United States? Hmmm
sweet 240p vid.
Poor measurement methodology, which does not consider parasitic load of duct system, nor the cone shaped sampling pattern of the IR thermometer. This is fine for a homeowner, but definitely not a professional HVAC/R tech.
Anonymous Person shut it unless you have a better video we can all watch you tool
Anonymous Person Works within + or - of the probes I've compared it with.
@Anonymous Person,
- the method of testing (inside the home - not in attic or on roof),
- cost of equipment ($15-$20),
- values used to diagnose (temp °F instead of CFM, FPM, or pressures),
as well as other things, ALL point to this being for a HOMEOWNER. What part of this video do you believe would be of help to a "professional HVAC/R tech"? The part where he points the laser at the register? I think you just wanted to criticize so you could create an opportunity to say: "cone shaped sampling pattern" cause you think it sounds smart. It doesn't. It makes you look like you didn't understand the video, since you can't even properly identify who the intended audience is.
Dale Teh T? 🍌
I couldn't hear you. Then, when I turned my TV all the way up so I could, your camera man got close to you and you were extremely loud, so I had to turn my TV down 30 notches. Then you walked away and I couldn't hear you again, so I turned it up all the way, camera man approached you, LOUD!!!! Turned it down, then this repeated until the video was over. I wish I knew what you were saying.
so true!
Very poor picture quality
Thanks
Thanks