Alpine Heating & Air Conditioning do a great job, and I have no qualms, whatsoever, with their work. We hired them to move our ball heater from downstairs into the attic, so that we could use the space as a pantry. They were in and out in two days, and didn't leave a big mess.
The service tech was cordial, and answered all our questions. He showed up on time, and got right to work. It was cold in here, too, but he kept right on working. When he was done, the owner came out to personally inspect the work.
If you require high quality heating and air service, you should try Alpine. They are a licensed contractor, not some fly-by-night company. At least have them come out and give you an estimate. You will be pleased with their work.