Most of us believe that if we are using power in our homes we are spending money. We are of course, but sometimes we have to spend a little to save a lot. Many times I have advocated and explained to my clients the benefits of running the fan in a furnace 24/7. The benefits are three fold.
First, the electric motor that runs the fan is designed to run all the time. To get an electric motor moving it takes a surge of power, sort of a kick-start. Each time we kick start the fan motor, that kick hurts it a little bit. After many years of getting kicked the motor life is shortened
Second, by running the fan you are re-circulating the air in your home. The majority of air returns are located in the ceiling. That is also where the warmest air in your home congregates. In two story homes one of the return air ducts are at the top of the stairs in the ceiling of the hall or landing. Heating systems are designed that way because heat rises and the return air duct are located in ceiling to capture the warm air and put it back through the system using it again to heat your home. I inspected a home a few months ago that didn’t have a return air upstairs. In two hours the temperature on the main floor went up one degree, from 61 to 62. The heat was rising up the stairwell making the upstairs 78 degrees.
Over the years, clients have shared with me money saving on their heating bills after they started running their furnace fans all the time. The lowest savings was $400.00 a year and the most, the house was a large two story with very tall ceiling, was $100.00+ dollars a month. It cost about $200.00+- a year to run the fan all the time. Running the fan will make your home warmer, eliminate dead air spots and save you money.
Third, as the air is recalculated through the furnace it passes through the filter and is cleaned. The air in your home is about five times more polluted than the air outside. Air in the home is spoiled from smoking, heating fires, cooking, cleaning chemicals, building products, pets, kids… One person told me that they run their fan all the time to help heat their home, but didn’t realize the filtering benefits until she took her five year old computer in for repair. When the technician took the outer case off the computer, there was no dust on the inside of the computer! It takes about twenty minutes to clean the air in a 2000 square foot home.
A top quality filter can take micro particles out of the air. For those who have pollen or pet allergies, this can be very beneficial. I would recommend using the best washable, reusable filter you can find. They cost a little more upfront, but will usually pay for themselves in a year and will last many years. Even quality filters should be cleaned or changed about every ninety days, depending on the environment in your home. A dirty filter restricts air flow, over heats the fan motor and will cost you more money to heat and cool your home.
Anyway, for what it’s worth.