Sometimes, people neglect the things that should be replaced, such as
furnace filters. What many do not know is that a constant maintenance of the furnace would greatly improve
energy efficiency and decrease costs.
Replacing the filters about once in a month could already renew its function of filtering air and removing dirt particles in the air. It is recommended that filters are replaced than washed off, for convenience and to ensure that
health of the people would not be endangered.
