Today the bare minimum allowed by law is 78.
Residential gas furnace ratings.
For example an afue rating of 96 percent means the furnace produces 96 btu of useful heat for every 100 btu of natural gas burned.
Notes on furnace ratings.
Of the 24 gas furnace brands we rated payne stands out as the most reliable earning an excellent rating for predicted reliability.
Boilers are fueled by natural gas heating oil propane electricity or a biodiesel oil blend.
Both 80 and 90 plus furnaces are available.
It features a tubular aluminized steel primary heat exchanger and a 4 speed direct drive psc motor.
Most new furnaces display an annual fuel utilization efficiency afue rating which is a measure of fuel efficiency.
The modulating gas furnace by trane operates at an afue level of 97 3 which is highly efficient.
Furnaces with high afue ratings can save you a significant amount of money in heating and electricity bills.
New systems are very energy efficient with efficiencies as high as 98 5 percent.
The fleet efficiency or furnace rating of a particular furnace brand indicates nothing about furnace quality or furnace durability.
1 stage 2 stage and variable capacity gas furnaces.
Bryant gas furnaces are capable of very high afue ratings of up to 90 or more.
The single stage furnaces perform between 80 and 95 afue while two stage models operate between 80 and 96 7 afue ratings.
What type of boiler.
Six other brands earn very good ratings including american.
10 total furnaces are produced in a range of sizes from about 60 000 btu h to more than 140 000 btu h.
Trane s gas furnaces combine fuel efficiency with noise reducing technology for complete comfort.
All of our furnace reviews are available here.
Efficiency is measured by afue annual fuel utilization efficiency which refers to how well your furnace translates fuel into heat.
Furnaces with higher afue ratings typically cost more but they can reduce the overall cost of heating your home.
In the 70s most gas furnaces had an afue around 65.
These top furnace brands have strong contractor and service networks offering professional assistance throughout the year.