During an air conditioning system installation, one of the vital steps our HVAC professionals take is to size the new AC. This doesn’t have anything to do with the physical space the unit takes up. It’s about the cooling capacity of the new system. It’s important for an air conditioner to have the right cooling capacity (i.e. “size”) to match the cooling requirements of the house. It must be neither undersized or oversized.
It’s simple to understand why an undersized air conditioner is bad news. An AC that doesn’t have enough cooling capacity to keep up with the comfort needs of a house will run constantly and still not be able to provide sufficient comfort.
It’s tougher to understand how an air conditioner can be too powerful. After all, why not err on the side of too much cooling? The house may need the extra power in an emergency, and at other times the AC can be turned down.
The truth is that an air conditioner that’s too powerful causes as many problems as one that’s underpowered.