Gas Furnace Efficiency Ratings

An oil furnace generates heat using oil while gas furnaces are fueled by natural gas propane.

Gas furnace efficiency ratings.

When comparing furnace reviews you should consider a variety of factors like gas type efficiency cost warranty and more. These days 95 afue is a common rating among new gas powered furnaces. Efficiency is measured by afue annual fuel utilization efficiency which refers to how well your furnace translates fuel into heat. Reliability is the hallmark of these identical brands.

The lowest efficiency allowed by law for new gas furnaces is 78 percent and some new models achieve 97 percent near total efficiency. Today the bare minimum allowed by law is 78. 4 5 out of 5 furnace options. Lennox slp99v variable capacity gas furnace series.

The modulating gas furnace by trane operates at an afue level of 97 3 which is highly efficient. The brand offers a variety of furnaces to choose from with a life expectancy of between 16 and 20 years. Precise comfort technology allows the furnace to keep the temperature held exactly where you want it. High efficiency furnaces offer 90 or more afue.

All gas furnaces installed in the northern states about 30 in total must be 90 percent efficient. Rheem furnaces rank highly in terms of ease of maintenance sound rating and energy efficiency. The r98v s value comes from a modulating design and a variable speed blower. As of january 2015 these requirements are pending.

A standard efficiency furnace provides 80 annual fuel utilization efficiency afue. Trane s gas furnaces combine fuel efficiency with noise reducing technology for complete comfort. Weatherized gas furnaces must be 81 percent efficient. They re both very dependable and are a good value based on cost.

The prestige series r98v rheem s most efficient gas furnace has an afue rating of up to 98 7 percent making it the most efficient model we came across during our research. Non weatherized oil furnaces must be 83 percent efficient. In this type of furnace 20 of the energy produced by natural gas is expelled as exhaust. The price of a furnace generally rises in step with its fuel.

In the 70s most gas furnaces had an afue around 65. The single stage furnaces perform between 80 and 95 afue while two stage models operate between 80 and 96 7 afue ratings. 1 stage 2 stage and variable capacity gas furnaces in 80 and 90 plus options. So a 95 furnace is more efficient than an 80.

The better units are equipped with variable speed blowers.