Sizing Your Furnace or Air Conditioner

A couple times a year we get calls from customers who have had their new furnace installed by another HVAC contractor.

They proceed to tell me that it doesn’t heat their home properly, or one of the rooms isn’t warm enough.

I always ask if they had a heat calculation done on their home prior to installation, and almost always they answer,

“I don’t know what that is.”

Make sure that when you have a HVAC company give you a free estimate on a new furnace or air conditioner they do a heat gain or heat loss calculation.

It’s common practice, and unacceptable if they don’t calculate one for you.

What is a heat calculation?

A heat calculation is used to determine how much heating or cooling your house needs, using BTU’s (British Thermal Units).

A few factors are required for this calculation, including:

  • Size of your home
  • Insulation
  • How many floors you have
  • Windows
  • The duct runs

The size of your furnace or air conditioner plays a large role in efficiency, directly impacting your monthly energy costs.

Why is a heat calculation so important?

If a furnace is too small for your home, it will have to work extra hard in order to bring your home to the proper temperature, compromising their efficiency.

If a furnace is too large, it will heat your home too quickly, cycling on and off constantly, thus driving your efficiency down as well.

Ask the HVAC Company who is visiting your home to provide you with details regarding a heat calculation. If they haven’t made one, be sure to ask them how they determined the right size system.

Conclusion

You don’t need to worry about the sizing of your HVAC equipment too much as Metro Heating and Cooling will perform a heat calculation for you to determine the exact size furnace or air conditioner you need to keep your home at the desired temperature.

Contact Us at (651) 294-7798 to tell us what you need.