GreenFan was founded in 2012 to develop products to improve Heating, Ventilating, Air Conditioning (HVAC) efficiency and Indoor Air Quality (IAQ) including the: Smart Fan Controller (SFC), Efficient Fan Controller® (EFC®), e-wire and +wire® adaptors for smart thermostats, bipolar ionizer, and smart economizer®.
The smart fan controller (SFC) works with smart thermostats to increase cooling and heating energy savings. The SFC provides variable fan-off delays after thermostat cooling or heating cycles to deliver additional sensible cooling or heating energy to the conditioned space which improves energy efficiency, thermal comfort, and extends off cycle times. The SFC fan-off delay varies from a minimum of 0 to 2 minutes to a maximum of 3.5 to 6 minutes for cooling or heating depending on system type and is adjusted based on the cooling or heating on and off times. The smart SFC can also control a gas furnace heating fan from a default fan speed to a higher fan speed after the heat exchanger has reached operating temperature (for enabled systems) to reduce the time required to satisfy the thermostat call for heating and reduce the on-cycle time. The SFC does not add fan-off delays to short cycles or to hourly or intermittent fan-on durations which can save 183 to 1095 kWh/yr compared to other fan-off delay controllers. The SFC is made in USA, is more reliable, lasts 10 times longer, uses 2.5 times less power, and saves more HVAC energy than other fan-off delay controllers. The SFC is UL listed, doesn’t void equipment warranties, and works on all air conditioners, gas furnaces, heat pumps and hydronic systems. The SFC® has a 5-year warranty and lasts for life of HVAC equipment. The SFC hardware and software are licensed per US Patents 8763920, 9328933, 9500386, 9671125, 9797405, 9995493, and pending patents. The variable fan-off delay and fan-on fault detection messages and occupancy-sensor based fan-on correction software algorithms are licensed per US Patents 10281938, 10533768, 10712036, 11187425, 11175060, and pending patents. GreenFan has sold more than 140,000 SFC and EFC units since 2012.
GreenFan has also developed the world’s most energy efficient common wire (c-wire) adaptor for smart thermostat (e.g., +wire® is licensed per US patent 10921014). The +wire® continuously charges smart thermostat batteries and enables control of 24VAC HVAC systems, gas furnaces, wall furnaces, heat pumps, hydronic, and/or radiant heating systems without a common wire. The +wire with 120/24VAC transformer continuously charges smart thermostat batteries and enables control of 2-wire millivolt gas furnaces or gas fireplaces with no common wire and no built-in 24VAC transformer (step 2a next page). The +wire® is made in USA, easier to install, more reliable, lasts 10 times longer, and uses 3 to 6 times less power than other common-wire adaptors. The +wire® has a 5-year warranty and lasts for life of HVAC system or gas fireplace.
GreenFan® bipolar ionizer improves indoor air quality by deactivating 97.6% of the SARS-CoV-2 virus that causes COVID-19 in 60 minutes based on laboratory tests conducted by Innovative Bioanalysis in a 1,280 ft3 chamber per BSL-3 standards. The Greenfan bipolar ionizer has a resettable fuse and is unaffected by magnetic fields, provides consistent ion concentrations over 20 to 30VAC, and works with 120 to 240VAC with accessory transformer Model 1601-01. The GreenFan® bipolar ionizer is third-party lab-tested Verified Zero Ozone to meet UL 2998, certified to CSA C22.2 #187, conforms to UL 867, and pending CARB certification. The Greenfan® bipolar ionizer connects to fan G and heat W terminals and is installed on fan inlet of central HVAC systems to deactivate or remove airborne pathogens. The GreenFan bipolar ionizer is made in the USA and is covered by a 5-year warranty when installed, operated, and maintained per manufacturer’s instructions. The GreenFan® bipolar ionizer is licensed per US patent 11173226.
The GreenFan® smart economizer® provides perimeter gap sealing, automatic calibration for optimal outdoor airflow and indoor air quality, cooling delay correction, fan-on correction, and fan-off delay. The smart economizer® energy savings are 10 to 20% for cooling plus fan and 10 to 20% for heating based on Intertek laboratory tests, Energy+ and DOE-2.3 simulations. The smart economizer® supply fan control allows occupants to turn on fans to improve Indoor Air Quality and detects and turns off fans when building is unoccupied. The smart economizer® has a 5-year warranty and will last for life of the HVAC equipment. The smart economizer® is licensed per US Patents 9671125, 10,001,289, 106631186, 11022335, 11029061, 11029057, 11175060, 11187425, and pending patents.