Your Cooling System and How It Works – Part One

After that 102 record breaker heat wave your air conditioner got a work out. The good news was is was a dry heat wave vs. the usual humid weather making it a little easier to cool the air in your home. Some common issues for houses that don’t seem to cool are restricted air flow from the cooling coil in your furnace. More often than not the coil is too small for the physical opening of your furnace. 

 If this were the opening of the furnace at the top the indoor coil should fit the actual physical opening. There are times when the coil may be a little smaller but it should not reduce the opening by more than 20%.  If the coil is smaller the reduction in the “push” of the air increases meaning the unit works very hard to distribute the cooler air in your home. Longer run times equal bigger bills from the electric company. The square footage is your home might only need a 2 Ton Cooling system but the 2Ton Coil might be too small for your furnace. This can be avoided by using the same brand cooling system as your furnace. The coils are usually manufactured for the furnace size opening, Using a different brand may not fit properly so BEWARE those reduced pricing air conditioning deals. Replacing the coil with the correct size will pay for itself in one cooling season and you’ll be more comfortable.


Another problem is a dirty coil. It’s very common for the heating and cooling systems to be in the same room as your washer/dryer. The lint from your dryer is sucked into the furnace and gets distributed through your furnace if you don’t change your filter frequently. Another common cause is pet hair and just plain old dust/dirt in your home. Yes, the picture below is a real picture. This is a coil that never got cleaned from a home where the filter boot return was at the bottom of the furnace (not recommended) that sucked air from the floor. The picture on the right is a clean coil. Check back later for part two.


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