Which DNA Testing Company Should I Use? The answer, as in many areas of genealogy, is it depends. Because different people test with different companies, many of which maintain their own databases of tested individuals, you will achieve the greatest chance of useful matches by either being tested, or sharing your DNA results, with as many companies as possible.
Cogeneration / Combined heat and Power (CHP) Cogeneration (cogen) through combined heat and power (CHP) is the simultaneous production of electricity with the recovery and utilisation heat.
Dual-Fuel Heat Pumps. A dual-fuel heat pump is an electric heat pump and a gas furnace all in oneâoffering you maximum efficiency during typical Southeastern winter weather, and a boost of gas heat when the temperature falls below freezing.