Now I don't know how "natural" you can be when it comes to heating and cooling your whole house, but I do have a recommendation for anyone in the market to a fair, honest, hardworking A/C guy.
His name is Alonzo Williams and he is the owner (and only worker) of Williams South Inc. Heating and Cooling. I had a BIG name company come last year to do a regular cleaning and check-up on my a/c unit because it was getting sluggish and they charged me $89 to tell me that I needed a $4700 new system and that mine was "un-cleanable".
This year I found Alonzo (also husband to a now very good friend of mine)! He charged me less and cleaned my system and now my a/c is running smooth as when we first bought our house! He is very honest and will not try to up-sell you to something you really don't need. He is also just out there trying to support his homeschooling family of 8 so if you are in need of some cool air or if this winter it gets to nippy for your liking give him a call!
Williams South Inc Heating and Cooling
904-424-1076
PS. I also filed a Better Business Report on the BIG A/C company and got my $89 back for lying to me!