How would you like to save on your heating bill this winter courtesy of NorthWestern Energy and an inventive person in Bozeman named John Walsh?
Walsh has created a device that is being installed all over the state of California to save energy and in now available in Montana free to you after the NorthWestern Energy rebate. This device, called GreenFan is a clever computer that connects to your furnace where the thermostat wires attach. It can be installed in 10 minutes. Here is what Walsh says about the product:
“Your furnace produces a lot more heat than it puts into your living area. Much of the heat is lost up the flue or dissipates in the ducts. The GreenFan quietly watches your furnace during operation and estimates the amount of residual heat available to heat your home. When the burner is turned off by the thermostat, GreenFan takes control of the furnace fan. Even though the fan will run on its own after the burner is switched off, the GreenFan estimates how much residual heat is available and it keeps the fan on a little bit longer. This process blows more heat into your home and therefore the furnace cycles less frequently. You save money on gas and you lower your carbon footprint. In addition to the extended fan time, the GreenFan product switches your furnace fan from low speed to high speed after 4 minutes of operation. This circulates the air through your home more efficiently.”
Walsh took his GreenFan product to a testing facility in Texas called Intertek. This independent testing facility found savings between 11% and 17% when tested on a brand new furnace right out of the box. The savings on older units are potentially higher.

The graph above is typical of the test results. The black line represents the heating efficiency of a brand new furnace. The green line shows the efficiency increase when the GreenFan product is attached. The difference between the black and green lines show the efficiency improvement and thus the gas saved to heat your home.
NorthWestern Energy feels so strongly about the savings, they have decided to offer a rebate on the product for the entire state of Montana and South Dakota. GreenFan is included in the NorthWestern Energy E+ Green program. You can install the GreenFan yourself, or have a contractor do it. The rebate is based on the size of your furnace. The average rebate is about $80.
Walsh’s company, Precision Energy Control, is making an offer that seems to good to be true! Through Precision Energy Control, Walsh’s team will provide the GreenFan and install it for the amount that NorthWestern Energy will rebate. That is right, after the rebate, you will have the GreenFan and installation for FREE. Every month you heat your home you could be saving more than 10% of your heating bill.
As Walsh puts it: “Who wouldn’t want to save money at no additional cost?”
Precision Energy Control can be reached at (406) 595-0297 and their web site for more information is:
