A short advice-focused video by Derek Cole explaining that, per the EPA, as little as 1/20 of an inch of dirt on HVAC components can reduce efficiency by over 20%. The speaker uses a 14 SEER unit as an example and urges regular cleaning and twice-yearly checks (heating and cooling) to preserve performance.
According to the EPA, 1/20 of an inch of dirt can drop your efficiency by over 20%. So if you just bought a 14 seer unit six months ago and you don't have it cleaned out, you know, at six months or at a year, you don't have it done, or you don't have a 14 seer unit anymore. So if you take an inch, slice it up 20 times, and that is how little bit of dirt can affect your efficiency. So it's very important to keep it maintained, keep it clean, and you keep it checked. You do it twice here because you want to do it for the check the heating and check the cooling.
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