An efficient HVAC system is an important part of any "green" home. As part of the annual maintenance of my pretty green home, I have my HVAC system checked out. This year I was a little late to the party and did not get my A/C system tuned up until nearly the end of May. What I learned was quite surprising.
I was always so proud of how little I used my A/C system due to the SmartVent that was installed in my home when it was built. A SmartVent opens and closes when you tell it to depending on the thermostat settings. For example, I set my SmartVent to turn on when the outside temperature dips below 63°. The vent opens and brings cool air in through the HVAC system so the air is filtered and all the icky particulates are stuck in the air filter. I love this system because it keeps my house, brings fresh air in without opening the windows and negates the need for air conditioning in our cool Sacramento evenings (most of the summer).
Or at least I loved it until the A/C man told me that maybe this system was not the best thing in the world. He was definitely not a fan. His opinion was that the SmartVent puts a strain on the furnace fan and is not as efficient in its cooling. That may have been his professional opinion but I just know that it cools down my house to around 67° on many days and I rarely run my air conditioner during the dog days of summer. I shut my windows and blinds when the house reaches about 70° or 72° and it rarely reaches 80 in my upstairs.
My home is only six years old and my air conditioner needed a new capacitor and he indicated that it needed coolant. Really? I hardly use this unit and it is going bad (can you say cheap system installed in a new home).
Given that my A/C unit will likely have to be replaced within less than 10 years I think I will continue using my SmartVent. I love the fresh air and having to use a light quilt in the summer because I am so darn cold at night. I can put the money I save by not using my air conditioner into an account I can use toward replacing the not so wonderful HVAC system in the future.