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Sturgis:(269)651-4499 | Bronson:(517)369-8102 | Coldwater:(517)279-1221
Sturgis:(269)651-4499 | Bronson:(517)369-8102 | Coldwater:(517)279-1221
Copyright Shamrock Heating & Cooling - 2013
Single-Stage

Single Stage Furnaces have one fan speed, and are available with an AFUE (Annual Fuel Utilization Efficiency) of both 80% and 95%. These furnaces operate at 100% BTU Capacity at all times. These are the most common furnaces, but generally the least efficient and loudest on terms of operation.

Two-Stage Furnace

Two-Stage Furnaces have 2 fan speeds, and are available with an AFUE of both 80% and 92% (or greater) These furnaces operate at 60% BTU Capacity, and progress to 100% as necessary. Two-Stage Furnaces provide a more uniform heat distribution, and are generally a bit quieter than Single Stage Furnaces.

Two-Stage Variable Speed Furnace

Two-Stage Variable Speed Furnaces are available with an AFUE of both 80% and 95% (or greater) These furnaces operate at 60% BTU Capacity, and progress to 100% as necessary via a variable speed motor. Two-Stage Variable Speed Furnaces are much quieter than Single Stage or Two Stage Furnaces. When additional equipment is added to a furnace, 2 Stage Variable Speed Furnaces are the recommended choices for 2 and 3 story homes, and furnaces that also include Air Purification Systems or Heat Pumps.

Three-Stage Variable Speed Furnace

Three Stage Variable Speed Furnaces are available with an AFUE of both 80% and 95% (or greater) These furnaces operate at 60% BTU Capacity, and progress to 100% as necessary via a variable speed motor. Three-Stage Variable Speed Furnaces are much quieter than Single Stage or Two Stage Furnaces. When additional equipment is added to a furnace, Three-Stage Variable Speed Furnaces are the recommended choices for maximum efficiency in 2 and 3 story homes, and furnaces that also include Air Purification Systems or Heat Pumps.

Modulating Variable Speed Furnace

Modulating Variable Speed Furnaces are the very best furnace available in terms of operating efficiency, even distribution of heat, quiet operation, and comfort level. This type of furnace is also the preferred choice when additional equipment of any type is added to the furnace heating system. The range of AFUE levels varies from 80% to 98%.
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