Always have a qualified technician do the repair. Many handy people will always try solving any problem at home; these people will also try doing their own denver HVAC repair. A furnace is an expensive installation and requires lots of care to prevent it from being damaged. By doing the repairs yourself, you increase the chances of screwing up the installation and causing more problems. There are technicians who have their work covered by insurance. When such technicians accidentally damage your furnace, the insurance company will compensate you. This ensures that you do not suffer losses from any repair work on your furnace.