CoreTemp installed two new gas appliances in 2008; a Ruud furnace and Rinnai on-demand water heater; the installation was fast and professional and both have operated perfectly and contributed to a great decline in our gas bill.
Equally impressive is the follow up service. Yesterday the weather turned cold so we fired up the furnace; it started up fine but then stopped working mid-day - our first issue with it. Next day, Saturday, I emailed CoreTemp through their web site and that afternoon Richard himself called and talked me though a simple procedure to re-set the furnace. He even called back 10 minutes later to make sure it was working, which it was! I highly recommend this company for service, product quality and integrity.