The Gallagher residence is a 3-bedroom, 3.5-bath, ~2,400 sq. ft home located in south central Montana. It was built to the Passive House International standard and features a Zehnder Q450 ERV + ComfoFond LQ geothermal ground loop preconditioner. The ComfoFond system consists of ~300′ of 1″ PEX buried 4′-6′ underground filled with glycol. The unit provides pre-cooling of the outdoor air during the summer and pre-heating of the outdoor air during the colder months. The energy used to run the ComfoFond system is less than 40 watts.

The Byron residence is a 3-bedroom, 2-bath home located in Red Lodge, MT. This high performance home was built with SIPs and features a Zehnder Q350 ERV + ComfoFond LQ geothermal ground loop preconditioner. It was important for the home owners to minimize the energy used to precondition the outdoor air, so the ComfoFond was a great option. The system utilized the flexible ComfoFlex 3″ duct as well as an additional level of filtering for the supply air. The additional filtering allows for MERV 15 level air filtration as well as activated charcoal filtration, which can be very nice to have during wildfire season. A Lunos eGo ventilation unit was also installed to provide ventilation between the garage and attached greenhouse.

Located on the shores of Georgetown Lake, west of Anaconda, MT, the Hale residence is a 3,600 sq. ft home currently under construction. The project is on the path towards PHIUS certification and features a Zehdner Q600 ERV with a 3.5 kW electric pre-heater. The electric pre-heater can be utilized whenever the building site doesn’t provide room for a geothermal ground loop. The system also includes the additional supply air filtration utilized in the Byron Project, which provides activated charcoal filtration and MERV 15 filtration.

The Eder residence is a re-build of a home that was lost in a fire a couple years ago. It is located ~20 miles west of Red Lodge, MT in the beautiful East Rosebud Canyon. It will feature a Brink Flair 400 ERV with an integrated electrical pre-heater and possible Pure Induct supply air filtration. The home’s compact form allows for a simple system that will utilize remotely located manifold boxes. Depending on the location of the main unit and the various supply/extract diffusers located throughout the home, mounting the manifold boxes in a separate location from the ERV itself can provide for both system and cost efficiencies. Minimizing the length of 3″ duct can provide cost savings as well as increase system efficiency. Beartooth Passive House will help in the ventilation system design for your project!