Fire officials learned a contractor had been on the roof – and was replacing a new heating, ventilation and air conditioning unit. Officials say a piece of cardboard was left underneath the unit ...

and marketers of a broad range of products for heating, ventilation, air conditioning, and refrigeration markets. The products include rooftop units, chillers, air-handling units, condensing units ...

Scientists have proposed a way to combine thermoelectric modules (TEMs) with rooftop PV to support heating, ventilation and air conditioning in buildings. They designed a wall-integrated TEM to ...

Exactly how long your heating, plumbing, roof, air conditioning ... can cut the life span of all types of roofs. Central air conditioning systems typically last 10 to 15 years.