Cleaning the furnace and ducts have a lot of benefits.

• It improves the quality of the air inside the homes. Accumulation of dirt, soot, and other pollutants can seriously affect air quality. Getting the furnace and the ducts cleaned professionally will eliminate this problem and significantly improve the air quality that you breathe.
• It helps to keep the house clean. Since the furnace is responsible for circulating warm air inside, a clogged and congested one will transfer all the dirt and pathogens back into the home. When the furnace is clean, all the pollutants are expelled outside, which reduces the dirt accumulation inside the homes.
• It reduces energy bills. A dirty and congested furnace will overheat and overwork, which can blow the utility bills out of epic proportions. But an efficient one will reduce the bills by a significant number.

Professional cleaning once a year is most ideal.

Yes. Changing the furnace filter every three months or so will ensure the best air quality.