Is an annual service on an HVAC air handler and condenser worthwhile? When I bought my home 5+ years ago, I was told the air handler is very simple, with only a few parts, so annual maintenance wasn't necessary. I've only had a service on the condenser once, when mice got in and chewed up wires. I change filters regularly, make certain the condensation line doesn't clog, and rodent-proofed the condenser. I have no issues but am wondering if an annual service would be beneficial. Thanks.

Hi all, AC system is 8 years old and stopped blowing cold air. Compressor fan is running so that tells me compressor is fine? Unless there are other components of the compressor I should check/test; that info would be appreciated. No debris on inside or outside of compressor; it's clean. Small copper line is hot to the touch, but larger copper line is not really cold (I compared to our other identical AC system which covers another part of our house). Is this a sign of low refrigerant (it uses R410a) or are there other possibilities/things I should check? My goal is to at least perform the diagnosis, as the HVAC techs here charge an arm and a leg and it's hard to get any sort of upfront pricing unless you ask about specfic repairs like "what is your pricing for an R410a recharge per pound?" Thanks in advance. Outside AC compressor specs: