Problems With Oversized Air Conditioners
Is your air conditioner too big?
It is likely that you will notice at least one of the following three problems if your air conditioner is too large for your home:
- It starts and stops abruptly
- Humidity isn’t being removed by your AC
- Your energy bills are higher
- When it’s hot, does your AC cool your home in 10 minutes or less? You might have an oversized air conditioner if that’s the case. An oversized AC will cool your house quickly then shut off, which raises your energy bills and wears out your AC (from all the starts and stops).
Indoor humidity levels should be around 30–50% with a properly sized AC. You’ll need a normal-length cycle for your AC to dehumidify your home. As we explained in the first problem, an oversized AC cycles on and off a lot. If your AC keeps shutting off, it won’t run long enough to remove moisture from your warm house. That could mean your AC is too big if your home feels really humid.
How'd you get in this mess?
It’s probably because the tech who installed your AC didn’t do a cooling load calculation. Cooling load calculations take into account things like:
- You’re home’s square footage
- How many rooms you have
- How many windows and doors you have
- Your climate
- Your home’s insulation
- How’s your ductwork?
- Does it leak?
- Plus a lot more
What makes a tech skip a cooling load calculation? Let’s say your old AC is 3 tons. Your tech might suggest simply replacing the 3-ton AC with a new 3-ton. What if your old 3-ton unit was already too big? If you replace an oversized unit with another oversized unit, you’ll still have the same problem.