I am a skilled professional that works for a Dor-Mar Heating & Air Conditioning company. I recently completed a job installing a new furnace and air conditioner in a residential home. The job required me to remove the old furnace and air conditioner, install the new units, and connect them to the electrical and gas lines. I also had to test the units to ensure they were working properly. The installation process took several hours, but the homeowner was pleased with the results.