Furnaces: What's the Difference?

Single Stage, Two Stage or Modulating Furnace, which to choose?

When choosing the best furnace for your home - the decision between gas, oil and electric isn't the only one you have to make. There is also the choice between the options below, which vary in speed, heating capabilities, and efficiency ratings. We have made your choice a little easier by outlining the pros and cons of each type of furnace for you. If you have further questions or would like to schedule an appointment, we would be happy to help!

Single Stage Furnace

A single stage furnace blasts the home with warmth

A single stage furnace has one temperature set point and one fan speed.


  • Lowest Entry cost initially for the equipment

  • Proves cost efficient heat for the entire home

  • Short equipment run times


  • House will heat unevenly due to the starting and stopping

  • The house could seem a little drafty with the furnace shutting on and off

Daikin DM92SS

Two Stage Furnace

A two stage furnace warms the house gradually.

A two stage furnace has two temperature set points and two fan speeds


  • Provides more cost efficent heat for the entire home

  • The home heats gradually as the furnace runs longer at  lower capacities 

  • Draftiness is replaced with comfort


  • Higher initial cost than the single stage

  • Heats more even than the single stage, but not as well as the Modulating

Daikin DM96HS

Daikin DM96VC

Daikin DM96VE


Learn more about the best furnace options for your household:

What size of furnace do I need?

What is Geothermal?

Improve your Furnace with Better Air Quality

Modulating Furnace

The ultimate in comfort when heating your home.

Modulating Furnaces have multiple set points and fan speeds


  • The long term the most cost efficient way to hear your entire home

  • The furnace runs consistently to provide even heat at lower capacity levels

  • Since the furnace runs consistently, the home heats evenly eliminating almost all draftiness


  • Highest Initial Cost

Daikin DM97MC