Tamarack

Tamarack Technologies has manufactured whole house fans and ventilation products since 1993 from its headquarters in West Wareham, Massachusetts, on Cape Cod. The company built its name on the HV Series whole house fan, designed to pull stale indoor air out and draw cooler outdoor air in as an alternative to running mechanical air conditioning. Tamarack's product development has stayed focused on indoor air quality, energy efficiency, and home ventilation since.

Product Lines

Tamarack's core lineup includes the HV Series whole house fans, such as the HV1000 and HV1600, available with R-38 or R-50 insulated door options that seal the attic opening when the fan is not running. Backdraft dampers, including the Cape Backdraft Damper, pair with the fans to control airflow direction. Transfer grilles and return air pathway products, bath fans, and garage ventilation fans complete the catalog for contractors handling whole-home ventilation projects.

Why Contractors Specify Tamarack

Homeowners looking to cut cooling costs without a full HVAC retrofit drive much of the demand for whole house fans, and Tamarack's insulated door design addresses a common objection to attic fans: heat loss through the housing when the unit sits idle. Contractors installing these systems get a packaged setup, fan plus sealing doors plus an optional damper, rather than sourcing components separately. The HV1000's low wattage draw also gives installers an easy efficiency comparison to point to against central air conditioning.

How to Choose Tamarack Products

Sizing a whole house fan starts with square footage and attic ventilation capacity, since the fan needs enough free attic area to exhaust the air it moves. The HV1000 and HV1600 cover most single-family home sizes, with the insulation rating, R-38 or R-50, chosen based on the climate zone and how much the attic temperature swings seasonally. Pairing a backdraft damper with the installation keeps outside air from leaking back through the fan housing when it is off, which matters most in colder climates.

Frequently Asked Questions

How does a whole house fan differ from a standard attic fan?

A whole house fan, like Tamarack's HV Series, pulls air from inside the living space up through the attic and out, cooling the entire home, while a standard attic fan only ventilates the attic space itself.

What is the purpose of the insulated doors on Tamarack fans?

The insulated doors open automatically when the fan runs and seal shut when it is off, preventing conditioned indoor air from escaping into the attic during the months the fan sits unused.

Should an R-38 or R-50 insulated door be chosen?

The choice depends on climate and energy code requirements. R-50 offers a higher insulation value and suits colder regions or stricter efficiency targets, while R-38 fits more moderate climates.

What does a backdraft damper add to a whole house fan installation?

A backdraft damper, such as the Cape Backdraft Damper, blocks unwanted air movement back through the system, helping maintain the seal the insulated fan doors are designed to provide.

Can Tamarack fans replace air conditioning entirely?

Whole house fans work best as a supplement that reduces air conditioning runtime during moderate weather, pulling in cool evening or morning air rather than replacing mechanical cooling during peak heat.