Quest is the world leader in dehumidifiers and their powerful units are a standard fixture in almost every commercial cultivation facility in the US, Canada and Europe. Quest manufacture a full line of the most energy efficient commercial grade dehumidifiers on the market.

Quest is a division of Therma-Stor LLC, builds quality, energy-efficient dehumidification equipment designed to perform in commercial environments.

Quest has the solution for any indoor gardening application. Quest dehumidifiers are the most energy efficient on the market, using the least electricity, removing the most pints of water per kWh over the widest temperature range. Quest’s innovative designs add minimal heat load to your HVAC.

A Quest dehumidifier pays for itself in energy savings while naturally helping to prevent pests, mold, mildew, and disease, allowing our users to eliminate pesticides during growing.

Quest is manufactured in the USA to high performance and electrical safety standards (ETL Listed/UL Certified).

Accept no substitute — protect your property, your plants, and your income.


About Therma-Stor

Quest is located in Madison, WI. We manufacture here in the U.S. with over 200 employees. Though many manufacturers have moved production offshore, our management vision and principles have a deep rooted foundation here in America. We believe people value great products. We strive to support each other, our customers, and our communities.Therma-Stor LLC was established in 1977 to apply advanced heat transfer technologies to residential and commercial equipment. Beginning with heat recovery water heaters, Therma-Stor now also manufactures residential dehumidifiers, including the Santa Fe series free-standing dehumidifiers and the Ultra-Aire series whole house ventilating dehumidifiers.


Therma-Stor also offers HI-E Dry plug-and-play dehumidifiers; Quest Climate Control Equipment for construction, concrete, and painting applications; and Phoenix restoration equipment for dehumidification, air scrubbing, water extraction, and evaporative drying.