Kevin - the owner and main (or only) technician - was very helpful. We recently bought a place and couldn't figure out how the A/C worked (the thermostat had no switch on it and the A/C didn't come on when it was turned way down). He came over and figured out how it was set up (it was wacko) and told us how to get the system functioning properly. We were having wiring work done the following day and Kevin offered to come back the following day at no charge, after the wiring work was done, to attach the new wires to the furnace & A/C unit and test the thing out.
He was friendly and helpful and we felt like we got a very square deal. I'd highly recommend Andy's if you've got problems with your heating or A/C.