Home AC checkup - how to avoid getting ripped off?
I'm thinking of having an HVAC guy come out to check our home AC, it still cools but not as much as I think it should, and lately it's been making a kind of oscillating-humming noise (maybe uneven fan blades?). The checkup is cheap but I'm sure they are looking to sell you additional repair services, "oh yeah you need to get the optional rustproofing package". Other than trying to find a reputable shop, are there any tips for reapirs that AC repairmen might suggest that I should actually consider versus those that are
pure margin gratuitious?