One should always keep it in mind that HVAC units, whether it is air conditioner or heater, are designed to bring 20 percent of change in the existing temperature level of the air. Pushing a machine to perform beyond its threshold limit is may result in poor performance of the device and might also cause damage to its major parts. This can be quite expensive financially as well as time wise and require a great deal of efforts to fix the problem. It is far wiser to have a plan ahead of time on how to use the existing setup