#1 Heat Pump Sizing Mistake 2024 🔥 | HVAC Buyer’s Guide
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- Опубликовано: 4 мар 2024
- In this video we talk about heat pump Systems in 2024 and everything you need to know. If you're shopping for a heat pump there is a lot to consider and you want to make sure your system is sized properly. An oversized heat pump won't work properly for several reasons, and in this video we cover several of the costly repairs and conditions that are created by oversizing heat pumps.
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![HVAC professionals aren't sizing equipment appropriately [condensed version]](http://i.ytimg.com/vi/_hAuKtoRxJI/mqdefault.jpg)
At 10:35: "and and shut it off." That made my day!
lol totally… did a double take stutter there lol
Upgrading from an R20 attic to R50 knocked about 20% off my heating and around 30% from my cooling run time. I guess attic heat soak is a thing. It'll still take 10 years to pay back, but it felt worthwhile.
Right on, yeah things are typically more comfortable too and less drafty
Great video :)
It's really hard to find youtube videos specifically about sizing for heat pumps. It's also difficult in get someone in my area (10598) to perform a proper analysis.
Companies are always sending a SALESPERSON who either wants to slap a heat pump onto to my current ducting or recommend a ductless system for my entire home. (I currently have a 15 year old AC ducted system & a baseboard hot water, oil fired.)
I would respectively like to see a deeper dive into sizing, including benefits of upgrading insulation, flex versus tin ducting, an example of ducting system calculations, & when a hybrid heat pump system (ducted & ductless) makes sense. Lastly, anything else you do when you calculate a home's sizing.
(Down the road I would also love to see a global analysis of a heat pump / solar powered system, including backup battery economics. Maybe this can be done through a solar expert who makes RUclips videos that you think does a great job.)
Great suggestions! I will definitely use these for some videos, they’re common questions we get asked about and I’d be happy to go through some sizing examples and make some videos about these.
I live in northwest Montana and have radiant floor heating with an electric boiler and no air conditioning. I am wanting something like the Daikin Altherma for both heating and cooling and possibly hot water as well. If I understand correctly the Altherma is not currently available in the US. Is there a reliable alternative or do I wait for the Altherma? Love your videos.
Thanks for the video. I have a 2700 sq ft home in NY, with a single zone AC for the entire home. We have 7 registers on each floor, mix of 8 inch, 6 inch flex and 4 inch in the 2 bathrooms. We have an older 13 seer Trane 4 ton AC unit, which is not keeping up. We added 2 zone mini splits on the 1st floor in the hot spots (window dinning room, kitchen) which helped. I would like to change the central system to a variable speed heat pump and am leaning towards a MR COOL / MIDEA / inverter type system with handler sized at 5 tons. These units have dip switches to go to 4 tons if needed, is that a good plan? I totally agree with the attic sealing being the best bang, will be doing that as well.
Depends on the heat load calculation, that’s probably ok but it has to be sized for the duct work too. The Bosch type inverters / Midea have dip switches and then they throttle themselves down so it will limit its capacity. If it’s not keeping up currently common causes are things are dirty / coil condenser etc, low on charge, but sizing could also be that. If 2700’ is all above ground then at a glance doesn’t sound off but that’s where heat load calc comes in just to get a more solid idea
We live at sea level in N. California in a 1,700 SF house and recently had a 3 ton Daikin multi zone mini-split installed to replace our 95kBTU natural gas forced air furnace. I think we were losing a lot of heat in the ductwork. It's really quiet and no more drafts from the registers.
Right on! Sounds more comfortable, you may have been especially if the ducts were disconnected or falling apart (if you had flex ductwork), mini splits are great
Ignoring the increased possibility of equipment failure, if your system requires more airflow your ducts will be noisy. This is especially obvious if you have a zoned system where a house-sized system will end up directing all its air into one smaller "half" of the home.
Definitely!
Thanks for the comment, good information and definitely true on zoned systems
Very good but 99% of the time is stretching it. When we do heat loads we change the design day at 10 degree intervals so we are able to better calculate our heating curve. We do this because modulating boilers use outdoor reset controls but we also do this with heat pumps with fossil fuel backup. In my area we use a design day for heating at 9 degrees. usually the heat pump sized for a/c will satisfy the load to around 30 degrees. As the switchover is now done by the thermostat with an outside sensor it becomes relatively easy for me to instruct the customer how to change the parameters. I will usually set the switchover at 25 degrees and inform the customer if they cant get the stat to satisfy, bump the switchover to 30 degrees. Our weather here during the winter is below 30 much more than 1% of the time. I would say the heat pump will satisfy the stat 65% of the time but not 99%. Another point is most heat pumps are based on max tonnage at 47 degrees so you need to look at the performance chart to see what BTUs are being put out at these outdoor temps. Many of your cold weather inverters will put out undiminished BTUs down to zero but it is worth looking at the COP of these units at these lower temps as depending on your cost for electricity may not be worth running it. Propane here was 1.27 a gallon this year. That is 92k BTUs for a 1.27 and electric has gone up considerably the last couple years. So the switchover is not solely based on BTU output but also cost of operation not to be confused with "efficiency". Excellent video.
Excellent thorough comment thank you! A lot of good information, we pay over $3 a gallon for propane here so off grid applications make more sense if the system is keeping up but yes you definitely have to look at COP and output at those lower numbers!
Hi, another great video! In it you mention the Daikin Fit Enhanced. I haven’t been able to find any info, technical or otherwise on Daikin’s website and I’m considering the Enhanced for my new CCASHP but only if I can find some technical performance info on it. As a rep just wondering if you can either post some info or maybe email the info to me assuming there aren’t any issues with doing that?
If you search DZ6 the model number has performance charts for the Enhanced as well
The model number ends with E, it comes in 2,3,3.5 or 4 ton, and they all maintain at least 75-85% Capacity at 5F, and they have a COP over 2.2+ at 5F as well. That’s what in the charts if you’re looking for the technical data. Happy to post something here thanks!
@@TheHVACDopeShow thanks so much Howard, I’ll see what I can find. Hopefully a success!
Are you guys authorized Rheem heat pump dealers? Thanks for the info. I’m going to replace my two system central ac and furnace soon.
Right on our pleasure, and currently no we don’t sell Rheem. We’ve reached out to them but they don’t really have any cold climate heat pump products that work well for us so we haven’t considered offering them because it’s a big product request we get in Colorado. I’d be open to looking at them if they had a cold climate product… that may have changed my last inquiry was about a year ago
What are the ways to measure the ideal air flow for an existing duct system?
The duct size, static pressure of the current system, and a heat load calc would determine if it can handle what is needed. A lot of times older homes need supplemental cooling/heating in the form of a secondary system in the attic or a ductless split system for the rooms that can't keep up. Obviously this also takes into account that your insulation in the home is adequate; doors, windows, walls, and attic.
Ultimately, a ducted HVAC system can only pass through as much air as it can determined by the size.
A static pressure test will tell if the current system is sized properly for what the ductwork can handle.
What he said ⬆️ lol
Do you get down to Colorado Springs? Or have recommendations for folks there?
Yes we do! Just let us know if you’d like some help or an estimate happy to help, this is a great time of year to get stuff done in Colorado. Typically March / April are shoulder seasons and we get progressively busier leading up to summer
Can I put a Daikin Fit on a double wide modular home? I have a 4 ton A/C coupled with a electric furnace. Thanks
Yes you can, not the heat pump but there’s technically a Daikin gateway that will pair with your furnace. The AC will modulate but the air handler will not so the furnace is still the same in terms of airflow, but the condenser is quieter. You’ll get the partial benefit from more efficient outdoor unit
Actually let me check because idk how the coil would integrate. Depends on your air handler / furnace setup. Mobile homes use a different air handler so it depends… is it like a standard mobile home Coleman furnace?
I've hit neg 20 last 2 years in lone tree
thoughts on Gas vs heat pump for garage heat?
Lone tree Colorado? Right on that’s our neck of the woods, for garage heat a ductless heat pump is fine (assuming you’re talking ductless?). 99% of the time the low in Denver metro Colorado is above 10F so those super cold nights a low ambient rated ductless like the Daikin Aurora or something else will keep up still, especially for a garage. Gas is more work because you have to run the exhaust and gas line and it’s not usually as nice. A ductless has the benefit of doing AC too if you’re working in the garage in the summer.
@TheHVACDopeShow if you have stuff that cannot freeze in your garage do you size differently?
Seems like the inverter technology is in the newer side. How reliable are they?
Inverter AC’s have been around since the 80’s, Daikin Pioneered bringing them to market. They’re reliable if installed properly. Most every mini split ductless on the market is inverter and that’s primarily what they run everywhere else in the world especially Latin America / Europe etc.
@@TheHVACDopeShowToshiba actually created the first residential inverter driven AC in 1980.
But why is it that some heat pumps have like “cool heat” (like the Carrier 25HHA) and not like warmer than skin temperature?
A heat pump will typically heat 20-30 degrees more than what the temperature coming into the indoor unit is. Although I can't specifically speak to that carrier unit as it could be installed improperly, wired wrong, have a bad electric heat strip or something else, the Daikin Fit Heat Pump Enhanced version optimizes comfort and rarely increases the indoor ambient temperature more that 0.2-0.3 degrees F during the Intelligent Defrost mode. This is where it needs to switch from heating to cooling for a brief moment to melt any ice buildup on the outdoor condenser. Daikin has worked to perfect this transition, and if installed correctly with a backup heat source, there will be no blasts of cool air coming out of the vents like other heat pump systems.
The audio on this video is pretty awful.
I live in northwest Montana and have radiant floor heating with an electric boiler and no air conditioning. I am wanting something like the Daikin Altherma for both heating and cooling and possibly hot water as well. If I understand correctly the Altherma is not currently available in the US. Is there a reliable alternative or do I wait for the Altherma? Love your videos.
Thanks right on! Yes there is currently but if you can afford to wait they’ll be more new tech coming out before year end (2024). Idk if R290 systems will make it by then however they will have other Air To Water systems out with a little better performance and some of the newer A2L refrigerants. The Altherma should be here by Q3 or Q4. Currently Nordic makes several air to water systems and so does Enertech. If you have space for geothermal that might make sense because Geothermal has higher COP’s at colder temps and if you’re able to install one they’re more efficient in super cold weather and very popular in Canada. Hope that advice is helpful lmk if you have other questions!