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Over Tonnage A/C

I have a four ton package heat pump on my home. My home only calls for a three ton. I currently have a unit that cycles every few minutes. If i were to replace the blower fan to a three ton fan, 1. would i have more or less of a cycling issue. 2 will there be a possible frozen coil issue. 3 what else could go wrong?

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A better solution than undersizing the fan (which would decrease your airflow and probably not satisfy the household as well) would be to change the deadband in your thermostat. (Disclaimer: best solution is always to have a properly sized unit!).
Most programmable thermostats have a "deadband" that can be programmed in. This deadband is a certain number of degrees, in heating and/or cooling, where the thermostat will not call the system even though you have reached a threshold temperature. I.e. System is set to call for cooling at 76 degrees. there is a 3 degree deadband. When the Tstat reads 76 it will add the deadband (3) and not call for cooling until the room temperature is 79. This will prevent the compressor from cycling quite so much.
Adjust your setpoint temperatures (i.e.76) with the deadband in mind and you can arrive at a range that is comfortable and reduces compressor cycling.
Good Luck!

Posted on Jun 01, 2010

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