Yep, knowing something needs to be done means nothing if you don't do it.See, that's why this is a great thread. Even though I know this stuff, from having been in the business (sold HVAC equipment in 80's-90's), I'd totally forgotten about cleaning my coils, and this reminded me. I'm pretty good at remembering to change filters, but it's been ages since I've done the coils. This reminded me I need to get on it, especially since my units are 15 years old, I really need to avoid stressing them!