If you haven’t changed your home’s air filters lately, this 1-minute video will demonstrate just how much energy your HVAC unit is wasting. A clogged air filter operates with a lot less efficiency.
Air filters should be changed at least once per quarter. In certain circumstances, however, more frequent replacements are warranted.
Also, when you replace your filters, don’t reach for the $0.99 cheap ones. Plainly, they don’t work. Instead, spend $15 to get a filter that works. Or, buy in bulk to save 15% from Amazon.com or a local hardware store.