Electric Plenum Heaters

A plenum heater is an electric resistance heating device that's installed in the open air space within the ductwork where ducting and furnace join. Air is heated as it flows across electric elements and then is distributed through the existing ductwork.

Adding a plenum heater is a low-cost way to upgrade your heating system and turn your fossil-fuel furnace into a dual-fuel system, which allows you to take advantage of our off-peak rates. A plenum heater can be installed while remodeling or during new construction and provides 100% efficient electric heat. Locations with low ceilings may not have adequate room for a plenum heater but your HVAC contractor can tell you if you have adequate space.

A plenum heater:

  • Can meet your home's total heating needs.
  • Works with fossil fuel systems in dual-fuel heating systems.
  • Provides supplemental heating when installed with a heat pump. You’ll get a combined efficiency of about 130%.

Save with off-peak rates

You can operate a plenum heater on our General Service Rates or install one as part of a qualified off-peak rate program, including Dual Fuel or Residential Demand Control (RDC), that offers a discounted price per kilowatt-hour. If a plenum heater is installed on an off-peak rate, part of the installation may require additional wiring, a second meter socket, and a service panel.

Rebates are available

Install an electric plenum heater on the Dual Fuel or RDC Rate and qualify for a rebate.

  • Receive a $500 per unit rebate for installing a 9 kilowatt (kW) to 20kW unit.
  • Receive $25 per kW rebate for installing units sized larger than 20kW.
  • A minimum 9 kW unit is required to qualify for a rebate.
  • Rebates totaling more than $10,000 require prior approval.

Learn more

Contact our Idea Center or call 800-493-3299 to find out if a plenum heater is right for you.

You also can consult these technology providers:

This is not an endorsement of the site’s products or manufacturer.