Intertherm is a brand that is nearly 100 years old. Founded in 1919 as the International Oil Heating Company, Intertherm was acquired by Nordyne in the late 1980s and is now one of several HVAC brands owned by Nortek Global, along with Frigidaire, Maytag, and Gibson.

Today, Intertherm specializes in producing heating and cooling equipment designed specifically for manufactured homes. Their product lines include split air conditioners and heat pumps, as well as gas, oil, and electric furnaces. They also produce packaged systems for both small and large footprint installations.

Intertherm uses Demand Flow Technology—a system that involves computer-automated testing of every Intertherm product. They stand behind the quality of their products with a 1-year warranty on parts and labor, 10-20 year warranties on heat exchangers in their furnaces, and 5-10 year warranties on compressors (specific warranties depend on the product and registration).

Intertherm generally offers minimum to moderate efficiency units. For instance, their split air conditioners and heat pumps offer 14-15 SEER efficiency ratings. These units incorporate reliable and efficient Copeland single-stage scroll compressors.

The packaged air conditioners and heat pumps come in 14 SEER and 16 SEER models. The 16 SEER models have increased efficiency thanks to the use of a two-stage scroll compressor. The two-stage compressor also helps the HVAC system keep inside temperatures steadier, enhancing comfort.

Additionally, Intertherm offers gas/electric packaged systems as well as a hybrid packaged system. The hybrid system combines an electric heat pump with a gas furnace. This allows for efficient heating and cooling year round, without sacrificing any comfort on the coldest winter days.

For heating, Intertherm produces gas, oil, and electric furnaces that can be matched with a split air conditioner. Intertherm’s gas furnaces range from 78-95% AFUE efficiency. They have dual shut-off valves that enhance safety by ensuring 100% gas shutoff.

Intertherm has been a leader in the development of oil-burning gun furnaces, producing the first one over fifty years ago. Their oil-burning furnaces specifically designed for manufactured homes continue to be near the top of their market today.