My ac system last had regular maintenance/inspection 9 months ago. Normally I have it done every 6 months but due to coronavirus the company I have a warranty with isn't honoring their warranty. And now my electrical usage is about 2x what it should be (according to the power company comparing my usage to my neighbors) and I think the AC is why. I'm located in Florida where it's usually 90+ degrees almost every day. I did an experiment where I covered the sun facing windows in my home and the electrical usage went down by half.
My concern with cleaning the coils is I was told by a tech to never use any chemicals in the AC, not even bleach. Most techs in the past told me you can use bleach or vinegar but this guy told me not to listen to them because any chemicals can damage the coil.
I suppose it's possible that the tech is both right and wrong. Maybe chemicals are always bad but you have to use them to clean the thing?
Can I just toss a lot of boiling water on it and let the gunk go down the condensation drain? I know how to clean a clogged drain line but are there any problems with using boiling water? Or do you have other suggestions?