Frequently Asked Questions

Why is UL listing important?

STANDARDS: UL inherently requires and tests for safety. Through comprehensive procedures and guidelines UL requires their standards are met before certification is granted.

VERIFICATION: A local UL field representative will visit a manufacturer at least four times per year to verify that the Listing Mark is only applied to products that are being built in accordance with the UL requirements.

COMMITMENT: When manufacturers are UL certified is shows their continued commitment to safety and quality.

UL Listing: E356046

Why should I buy the GreenFan® EFC®?

GreenFan® EFC® will save you energy and money and help the planet.  GreenFan® EFC® helps your air conditioner cool your home more efficiently.  You waste less energy and this saves you money and reduces the need for new power generation capacity.  With reduced power consumption, less green house gasses are released and this helps the environment.

How does the GreenFan® EFC® work?

GreenFan® EFC® intercepts the signals sent from your thermostat to your air conditioning or heater fan. GreenFan® EFC® runs your air conditioner or heater fan for a period of time after the compressor or furnace turns off.  For cooling, fan shuts off immediately when the air conditioning compressor is turned off by the thermostat which leaves cooling energy trapped in the system. The evaporator coil is still very cold and this cooling energy can be recovered to cool your home. The water that condenses on your evaporator coil normally goes down the drain. Operating the fan transfers heat to the cold water and cools your house like a “swamp” cooler. For heating, furnaces provide a short 30 to 90 second fan-off time delay, but this leaves significant heat in the heat exchanger up to 250 to 325F. This wastes heating energy that you already paid for. In heating mode after four minutes of furnace operation, the GreenFan® EFC® activates the fan relay normally used for cooling and increases fan speed from the low- or medium-speed normally used for heating to the high-speed normally used for cooling to supply more heating capacity to satisfy the space heating thermostat sooner, reduce furnace operation, and save gas energy. The GreenFan® EFC™ also recovers more energy from the heat exchanger by operating the fan for a longer period of time after the furnace has turned off to lengthen furnace off time.

 

How much can I expect to save?

Studies by Southern California Edison and Intertek (an international product certification and testing company) have proven that the patented GreenFan® Efficient Fan Controller® (EFC®) improves cooling and heating energy efficiency by 15%. 

How difficult is the GreenFan® EFC® to install?

GreenFan® EFC® can be installed in 10 to 15 minutes by a licensed HVAC contractor with special skill to know how to install the GreenFan® EFC® at the thermostat control terminal. 

Does the GreenFan® EFC® require any maintenance?

No maintenance is required.  GreenFan® EFC® uses no batteries and remembers your programming even with the power off.

Why isn't a product like the GreenFan® EFC® already in the market?

Pacific Gas and Electric, San Diego Gas & Electric, and Southern California Edison currently offer incentives for contractors to install the GreenFan® EFC® in their programs. More than 50,000 GreenFan® EFC® units have been installed in California since 2012.

 

GreenFan® has four issued US patents for the Efficient Fan Controller® U.S. Patent 8763920, U.S. Patent 9328933, U.S. Patent 9500386, and U.S. Patent 9671125. Several other patents are currently pending. 

 

My air conditioner already leaves the fan on, how is the GreenFan® EFC® an improvement?

Studies show that leaving the fan on for up to a 1.5 minutes will recover some cooling energy,  about 50% of the energy reclaim the coolness from the coil, it doesn’t capture the additional cooling capacity of the water that has condensed on the coil.  PG&E found “The standard time delays provided by the (A/C) manufacturers are not designed to take advantage of the moisture on the coil”

Where can I find the studies from the California utilities that prove the benefits of the GreenFan® EFC®

The Western Cooling Efficiency Center (WCEC) has the studies done for Hot and Dry climates on their web site: http://wcec.ucdavis.edu/content/view/80/98/.  From there you can select the Public Interest Energy Research (PIER) Program Final Project Report.


Can I install the the GreenFan® EFC® someplace other than the wall under my thermostat?

The best location to install the GreenFan® EFC® is in the forced air unit or packaged unit at the thermostat control terminal. 

 

What is the GreenFan® EFC® warranty?

 

GreenFan®, Inc warrants this product to be free from defects in the workmanship or materials, under normal use and service, for a period of 5 years from the date of purchase. If, at any time during the warranty period, the product is defective or malfunctions, GreenFan®, Inc shall repair or replace it (at GreenFan®, Inc’s option) within a reasonable period of time.

This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by GreenFan®, Inc that the defect or malfunction was caused by damage which occurred while the product was in the possession of a purchaser.


GreenFan®, Inc's sole responsibility shall be to repair or replace the product within the terms stated above. GreenFan, Inc SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY GREENFAN®, INC MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE 90 DAY DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.  If you have any questions concerning this warranty, please write:
GreenFan Customer Care,
6125 Bear Claw Ln    
Bozeman, MT  59715


Copyright Bear Mountain Design, INC 2010