I'm in Arizona and currently have a 4-ton split system that's about 30 years old and quite inefficient. Since I'm planning to remodel and sell my home in the next year or two, a friend in HVAC offered me a 5-ton condenser from 2013 for $4500, including installation. My home is 1,500 sq ft. I know that a larger unit could mean higher electricity costs and I might need to get a couple of dehumidifiers to manage the humidity. What downsides should I be aware of if I go for this larger AC unit?
3 Answers
You definitely need to ensure the unit is properly sized for your home. Picture it like trying to fill a bucket with a fire hose—too much flow! Ideally, you want a system that's about 120% of your calculated need to account for future changes or leaks. It sounds like that 5-ton unit might be overkill.
If it’s an inverter system, you probably won’t have to worry too much. These systems can adjust capacity flexibly. Otherwise, be cautious! A too-large unit will cool the place down too quickly, causing it to shut off and on repeatedly, which actually creates wear and discomfort in your home.
I'd be cautious about getting a used AC that’s over 10 years old, regardless of the price. It might be more efficient than your old system, but oversized units can lead to short-cycling. That means they won't run long enough to do a good job of cooling or dehumidifying your home. Just something to keep in mind!