Everyone wants a furnace that’s reliable, efﬁcient and quiet. And while performance and energy savings are frequently discussed, system noise is often an afterthought. So here’s what you need to know about making sure your furnace is as quiet as possible.
The higher the AFUE rating, the lower the noise.
Annual Fuel Utilization Efﬁciency (AFUE) is the rating used to indicate the efﬁciency of a furnace in converting fuel to heat. In short, the higher the AFUE rating, the more efﬁcient the furnace and the quieter it will be. AFUE ratings range between 80 percent to a maximum of 98.5 percent, so look for a higher rating.
Single-stage, two-stage or modulating technology also impacts furnace sound levels. Single-stage gas furnaces are either on, or off. This operation has the potential for ﬂuctuating temperature and sound in your home, as the unit turns on and off frequently.
Two-stage gas furnaces, on the other hand, offer an intermediate level of performance. Operation varies between ﬁrst and second stage based on demand, resulting in fewer stops and starts and quieter operation, especially when the unit is running at the lower ﬁrst stage.
Modulating gas furnaces typically offer the quietest operation—in the case of variable speed models, as much as 24 times less noise than conventional furnaces. Modulating gas furnaces maintain an ideal temperature by modulating heating levels in small increments. Comfort is dramatically increased as the furnace adjusts its level of operation up or down to offset the rate at which heat leaves your home.
Check your ductwork, too