Your HVAC needs maintenance in between seasons, to make sure it is working efficiently. Stuff just naturally collects! General debris, dust, grime, bacteria, mildew and mold, pet hair and other such material build up over time and cause your system to have to work harder to do its job.
But first–this is an IMPORTANT step! Don’t forget to do this one little thing before you clean your unit. See our “Do-It-Yourself: How to Clean Your HVAC Unit Safely With a Garden Hose, Part 1” and Part 2 videos for guidance on how to do the cleaning.