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Sizing a Heat Pump for Your Home

Heat Pump label
used to determine sizing

Heat pump label used to determine sizing for your replacement heat pump

Sizing a heat pump is a fairly simple process. You size it for the cooling load, not the heating. Some contractor’s use what is known as a manual J load calculation to determine the size heat pump a home requires. While this is a good way to size a system for a house under construction where all the insulation values and the tightness of the home are known, it can be fairly inaccurate on existing structures. The best way to determine the correct system size for your home is to access how well the old system worked. If your old system did the job in cooling, your new system will do the same job more efficiently.

If you are unsure of your system’s size look at the nameplate on the outdoor unit.  Almost all manufactures put the Btu rating in the model number. One ton of cooling is equal to 12,000 Btu’s. Most heat pump units start at 2 ton, or 24,000 btu’s and increase in half ton increments, skipping 4-1/2 ton.

Here is a heat pump label model number example:

heat pump label model number for sizing your replacement heat pump

4SCU13LE130P-1 — 30 is the answer.

This is a 2-1/2 ton system. Sometimes you have to do a little detective work to find the Btu number because there is no set location within the model number and it varies by manufacturer. If you can’t figure it out, give us a call or contact us with the number and we will be glad provide you with the system size.

If your old system didn’t do a satisfactory job in cooling your home, we will be happy to send out a technician, at no charge, to review your particular application and come up with a solution.