In theory, an air conditioning unit should last anywhere from 10 to 15 years, though some are projected to last longer. But the reality is that many of us find ourselves calling air conditioning companies for replacements sooner than we initially expected. This is often because we don't tend to the necessary AC repairs in a timely manner. However, living with an AC unit in need of repair often costs you money. For example, the EPA reports that 18% of a home's energy costs come from heating water, but additionally that re-cooling a hot home costs more than maintaining a home at a reasonable temperature. If your AC unit is struggling to maintain that temperature, you can expect your heating and cooling bill to rise.

With that in mind, let's look into some of the signs that your AC unit may need repairs sooner rather than later.

1. Warm Air

If your AC unit is blowing warm air rather than cool air, it's doing the exact opposite of what you want it to do, and there is most likely a failure occurring mechanically. Not only is it irritating, but it also raises your temperatures. This means that your AC unit will need to work overtime to keep temperatures regulated.

2. Strange Odors

If you sense a scent that reminds you of mildew, or perhaps a smell that is similar to smoke, you should have your AC unit inspected immediately. Air conditioning companies typically advise that AC units are inspected on a regular basis anyway (perhaps every one to two years). But if you're noticing a strange odor being emitted from your AC unit, you need to have it addressed as quickly as possible.

3. Moisture

While a certain degree of condensation is to be expected from AC units, once that condensation begins to get out of hand you could have a problem to deal with. It's important that you actively deal with issues occurring within your AC unit on hand, without delay.

4. Loud Noise

You'll typically hear a low hum from AC units. However, if that noise has gotten to the point where's it's interrupting your daily life, or is peppered by loud clanging or wrenching noises, there could be something wrong with your AC unit.

Don't hesitate to have your AC unit inspected. Be an active homeowner!