What Size Furnace Do I Need??

Here's how we determine what size furnace will be best for a particular home! At Advantage, We Got You.
Here's the original blog: www.advantageheatingllc.com/l...
Timestamps:
00:00 - How Are Furnaces Classified?
00:48 - Home Size Determines Furnace Size
01:06 - What Else Affects Your Furnace’s Effectiveness?
02:31 - What Happens When a Furnace is the Wrong Size?
03:06 - How to Find the Right Sized Furnace
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How Are Furnace’s Classified?
First, you need to know how furnaces are sized to know what size of furnace you need. Furnaces don’t come in the traditional small, medium, and large.
BTUs
A BTU is a British Thermal Unit. Furnaces are rated in by their output in BTUs. A 60,000 BTU furnace will put out more heat than a 40,000 BTU furnace.
Furnaces also have a rating based on their Average Fuel Utilization Efficiency (AFUE), or efficiency. Their efficiency rating should be on a prominent label by the Department of Energy.
Efficiency is graded as a percentage out of 100. Furnaces that use less energy to produce heat have a score closer to 100%. Most modern furnaces start at 80% and go to around 97%.
Home Size Determines Furnace Size
The size of your home is the biggest determining factor in what size of furnace you need. Your furnace has to be big enough to provide heat to all of your home. That’s why the square footage of your home is the number you need to know to get the baseline for the size of furnace you need.
It’s recommended that a furnace has 30 to 60 BTUs per square foot. The actual number depends on the climate which will get into in the next section.
There are a lot of other factors that need to be considered when shopping for a furnace. Each one will affect how many BTUs you need.
Insulation
Another factor to consider is insulation. A furnace pumps heat into your home. Insulation keeps that heat trapped in there. Naturally, the two work together.
Things to think about:
How old is your home?
What was the standard for insulation when your home was built?
Are there rooms in your home that are not insulated?
Have you had any events that could damage your insulation (such as water damage)?
Bring these subjects up with an HVAC professional. They will tell you how much that will affect the heating in your home and also give them a better idea of how to meet your needs.
Efficiency
Another item that needs to be considered is the efficiency of your furnace. While this may not have a direct impact on the heating it provides, it will impact how much energy it uses. A furnace with a higher efficiency rating will heat your home using less energy.
You will probably want to keep a furnace’s efficiency rating in mind if your home requires a substantial amount of heating. An efficient furnace that is installed properly can save you a lot of money on your energy bill.
Too Small
If your furnace is too small, it will struggle to heat your home. These are some issues you might encounter.
It runs for very long cycles.
The heating throughout your home is uneven.
The energy bill is larger than it needs to be.
Furnace breaks down more often or parts don’t last their full lifetime.
Too Big
If your furnace is too big, it will run inefficiently and will short cycle (run in quick, short bursts). This can cause a whole slew of problems. Below are some symptoms and what that will look like.
It will make your home hotter than desired in some rooms.
The furnace only turns on for a very short amount of time.
The furnace will have a noticeably shorter lifespan.
The furnace will use more energy because of the constant switching off and on.
How to Find the Size of Furnace You Need
We just told you all the things you need to consider finding the correct size for a new furnace. Now let's put that all together and tell you how to find the size of furnace you need.
Load Calculation
To calculate the number of BTUs your home requires, you will need to have a Manual J or Block Load Calculation performed. These are ways of putting all those variables into a formula to get a definitive answer on the size of furnace you need.
An HVAC sales professional will perform this calculation with you. If you’re not shopping yet and are trying to figure out if your furnace is over or undersized, you can contact your local utility company and see if they provide Manual J calculations.
There are also several formulas and apps available online if you wanted to try the calculation yourself. While we can’t guarantee those will be accurate, it can be a good starting place.

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Here's the original blog: www.advantageheatingllc.com/learning-center/what-size-furnace-do-i-need/

[@surefire07]

Simple rule: When outside temp 25F and below cold night, with reasonably insulated home, If your furnace kicks in every 20 min and runs about 8 to 10 min and turns off 10-12 min before its kicks on then your home has right furnace. If your furnace kicks every 15 min and runs for 5min then you have oversized furnace. If furnace runs more than 10 min and turns off shorter than its run times then you have under rated furnace and/or need good insulation inspection. If it is slightly over sized then you may ask tech to reduce output by reducing the furnace gas pressure, furnace blower speed temp-rise difference adjustment. He will also check the combustion analyzer readings.

[@zAlaska]

I went from 1250 gallons of fuel oil per season to 350 gallons of fuel oil per season just north of Palmer Alaska. I couldn't keep the building warm before anyway, not my huge Log Cabin. I suggest once you've selected the correct furnace for your home, you have a secondary heater for your primary room, similar to the smallest toyostove which is what I am using. At $5 a gallon I have secondary concerns to having a huge building warm I'm happy not to use during the winter. Circulating water from the water room to the heat exchanger I put in front of the toyostove I eliminate electric heating in the water room which usually maintains a temperature above freezing, the tap open slightly, warm well water periodically enters the tank. 4500 watts of flash Heating in the bathroom with a remote switch in my room to turn it on before I enter. And when the water room gets to 28 degrees and the water comes out like a Slurpee, I drain the 300 gallon tank of ice water and refill it with warm well water and the temperature in the room returns to 40° even as its -20 outside. An automotive Square wave power inverter keeps the toyostove running when the power is out with a couple of spare batteries.
And electric blankets help a lot, they will not run on a square wave, you can turn the thermostat down at night time or wrap them around you when you're cold. It's not like it's a climate crisis and there's two and a half times more people now then when I was a kid when it was a crisis, also a portable heat pump and which uses 1000 Watts and some solar panels I bought with cash and just plug in the wall, with a double electric meter, Alaska state-regulated it acts like a battery, what I put in I get back without a difference and any excess gets rolled over into the next month at $0.08 wholesale, credits are 8 year old are turned into checks, I don't make that much kind of power, but when it's 50° outside it replaces fuel oil as the sun shines. My toyostove uses only 20 watts of power and so it's easy to keep the heat on when the power goes out for 10 hours with a battery backup compared to a large furnace. With the price of fuel exploding, my bills have gone down paying my investment back instantly.

[@andrewsparks4112]

So what is the block chain formula?
Your competitors are more open about the formulas. That make them seem more honest.

[@JC-dc5iv]

This video is useless don't waste your time, they will tell you something you already know (you need to but the right size furnace for your home) then "you want to know what size furnace you need for your house contact our company" 👎🏽