The Problems Caused by an Oversized Air Conditioner

If you ask many experts, they would agree that air conditioner size does matter. Unfortunately, many people fail to realize how important it is to purchase the right-sized air conditioner for their home. Mostly, people opt for a bigger one, thinking that it might be good to have a larger unit, rather than a smaller unit. In fact, getting an oversized air conditioner can actually cause more problems.

The Effects of an Oversized Air Conditioner

Many people think that an oversized air conditioner will just push colder air into the rooms of their house, which they can compensate for by setting their thermostat temperature higher. This is very inaccurate. The truth is that an oversized AC will present some problems such as:

Your Air Conditioner Turns On and Off Often

When your air conditioner is too big for your house, it takes less time to cool off your home’s interior. This might feel nice in the short term, but bad things will ensue.

The excessively fast and powerful cooling process will force your air conditioner to turn itself off after it reaches the ideal temperature to avoid overcooling. As a result, you might find that your air conditioning unit turns itself on and off every once in a while.

Higher Energy Bill

So your air conditioner turns off and on again more often than it should. Meanwhile, it uses more energy to start up. Simply put, your oversized AC unit will consume more energy than a more appropriately sized one would. At the end of the month, you will end up with a higher electric bill.

Your Air Conditioner Will Be More Prone to Breaking

This on-off cycling also puts more pressure on the machine. If your air conditioner is oversized, it might experience overheating. It also tends to shorten the unit’s lifespan, especially if you don’t schedule regular maintenance.

Humid Air

Another problem that may arise from an oversized AC is the humidity level. Not many people realize this, but air conditioning also removes the moisture from hot, humid air. Ideally, indoor air has about 30-50% humidity. However, your air conditioner should run a full cycle to reach this humidity level. Since your air conditioner shuts off too soon, the machine fails to reach this humidity level, resulting in cold but still too humid indoor air.

Not only does humidity affect the room’s comfort level, but it also triggers mold in the system. Mold is bad for your HVAC system as it may result in leaks, inefficiency, decreased air conditioner performance, and a shorter lifespan of the unit.

What Am I Supposed to Do?

Every air conditioner has a specific size. To determine which size is the correct one for the specific room you plan to cool, here are a few things you need to consider:


  • the room size
  • the insulation level of the house
  • the climate in the area
  • the amount and size of openings in the room

Not every air conditioner seller knows how to determine the right size, so don’t rely too much on the salesman. If you are not sure which size air conditioner to buy, it is better to get one from a professional. This also applies to when you realize that the AC unit you bought is actually oversized.

Some people think that having too much of anything can never be that big of a deal. In fact, it can be a huge deal if you are talking about the size of your AC unit. An oversized air conditioner will bring some problems that many people fail to realize, so make sure to find the right-sized AC unit for your home.


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