Before specifying efficient heating and cooling equipment, it’s important to do what we can to reduce heating and cooling loads. Insulation is one of the key products to consider here, but because there are so many insulation products on the market, we look for additional benefits. Examples include cellulose insulation with recycled content, mineral wool insulation with no flame retardants, and fiberglass insulation with no formaldehyde binders. Other products in this area are high-performance windows and glazings, products that contribute to building airtight envelopes, products that reduce thermal bridging, and window-retrofit products.
With products in this area under constant development, we are always refining our approach. For example, as we have learned about insulation products with hazardous flame retardants and blowing agents that have high global warming potential, we have removed those products from GreenSpec, pending manufacturing changes. We encourage building professionals to pressure manufacturers for those changes through specification language and purchasing decisions.
Monte Carlo Ceiling Fans
Monte Carlo’s Avanti and DC ceiling fans use electronically commutated motors to provide superior energy efficiency. The Avanti models have a 52-inch span, but no remote, whereas the DC series are available in 52- and 60-inch spans and come with hand-held remote control. Neither model contains lighting, though add-on kits are available.
Select an HVAC fan that is sized properly for your needs and uses efficient motors and drive systems.
For ceiling fans used in open commercial spaces look for fans that move large volumes of air.
GreenSpec lists high-volume low-speed (HVLS) fans with efficient motors that spin long blades very slowly. Once spinning, the fans use little energy to maintain momentum while circulating air very effectively.
If you’re looking for a residential ceiling fan, choose one with an electronically commutated motor (ECM).
GreenSpec lists only Energy Star-certified ceiling fans that use ECM motors—motors using electronic commutators (rather than mechanical commutators and brushes), permanent magnet rotors, and built-in inverters. ECM motors maximize efficiency as fan speed changes, with almost none of the mechanical energy loss or heat generation you find in AC motors. These fans are up to six times more efficient than AC-motor-driven fans.
For residential ventilation fans, including in-line utility fans, spot ventilators, and range hoods, look for units that move air efficiently and quietly. If they’re not efficient, they’ll waste a lot of energy. If they’re not quiet, people won’t use them, potentially leading to moisture and ventilation problems.
GreenSpec lists ventilation fans that are certified by Energy Star and the Home Ventilating Institute and have an energy efficiency, or efficacy, of 4 or greater, measured in cubic feet per minute (CFM) of air moved per watts of energy consumed (a fan moving 80 CFM of air using 10 watts would have an efficacy of 8).
GreenSpec requires a sone rating of no more than 1.0, which is about as loud as a refrigerator. Many ventilation fans have sone ratings of 3.0 or more. Because in-line fans are further down the duct, they're quieter and don't require a sone rating.
Beware of larger range hoods and other ventilators that pull 250 CFM or more. Particularly in newer, relatively airtight homes, that much air movement could cause depressurization and potential backdrafts in other appliances. Size range hoods appropriately.
Whole-house fans replace the use of air conditioners by pulling cool air into homes through open windows in the early morning and after the sun sets.
GreenSpec lists only whole-house fans that incorporate sealed dampers and insulation commensurate with attic insulation. Note that these products need to be used carefully. Windows need to be open to prevent backdrafts or moisture being pulled from basements and crawlspaces, and attic ventilation has to be sufficient to accommodate the airflow. They should not be used if chemicals have been applied nearby or where exhaust fumes can enter the home.
Certifications
- Energy Star - Fans, Ceiling
LEED Credits
Ratings and Commentary
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