Gas Furnaces

Satisfied Customers

"My 11 year old gas furnace was not working. I got several estimates. After several different contractors gave the same conclusion that I needed a new unit, I did some research. I found www.scientificair.net on a website for NATE as a local certified contractor. After dealing with Joseph, I can't say enough positive things. He is extremely honest, reliable, knowledgeable and conscientious. I am very skeptical about hiring contractors of any sort because of being let down in the past. After checking many references and questioning everything, I hired Scientific Air. I feel I got better equipment for the money and I am extremely satisfied."
—Joel DuBois in Mechanicsburg







Does your home have this type of gas piping?

CSST Gas Piping

Corrugated Stainless Steel Tubing (CSST), flexible piping used for distribution of gas in residential and commercial buildings, has a good record for safety, with one exception, a lightning strike. Don't wait for the next thunderstorm. Learn More.

Can your gas furnace put your family at risk?

Heat Exchanger with near fire

Although not very common, a gas furnace that seems to be working fine can put your family at risk. If a heat exchanger develops a hole or crack, the hot exhaust might escape, possibly causing fire or carbon monoxide poisoning. Learn More.

How much can you typically save by replacing an old, inefficient furnace with a properly sized modern unit?
It depends on how efficient the new furnace is and how inefficient the old one was. AFUE (Annual Fuel Utilization Efficiency) ratings will tell you how much energy is being converted to heat. Read More.

Typical AFUE ratings for various furnaces and boilers
Compiled by the U.S. Department of Energy
Type Pre-1960 1960-1969 1970-1974 1975-1983 1984-1987 1988-1991 Post-1992
Gas furnace 60% 60% 65% 65% 68% 76% 78%
Gas boiler 60 60 65 65 70 77 80
Oil furnace 60 65 72 75 80 80 80
Oil boiler 60 65 72 75 80 80 80