Home Page
Air Conditioner
Heat Pump
Air Purification
Contact Us

810-724-8805       <<< mobile call links >>>      586-552-8805


Furnaces are rated by the Annual Fuel Utilization Efficiency (A.F.U.E).
Basically the efficiency is the percentage of fuel burned that will be used to heat the home as opposed to that wasted out the exhaust.

-100,000 BTU (British Thermal Unit) at 60% output will have about
60,000 BTU and 40,000 BTU of waste out of the exhaust

-70,000 BTU at 95% output will have about 65,000 BTU
and 5,000 BTU of waste out of the exhaust

A furnace that burns 30% less fuel, and provides the same or more output,
is going to save you on your heating bill.

Bryant 90 Plus Models
Bryant Furnace
Maytag Manufactured Home Models
Bryant Maytag

Living in Michigan a furnace must be capable of reaching 70 degrees indoors at a design temperature of 4 degrees; the colder it is outside the higher the heat loss, because heat travels from greater to less, and the greater the difference the faster the heat transfer. So a furnace sized to reach 70 degrees when it is 4 degrees outside is probably oversized most of our winter when the temperature is 35 degrees or higher. To accommodate for this, and to lower heating costs, manufacturers have designed furnaces to fire at a lower input rate during milder heat loss, while still being able to "ramp-up" during colder days. Basically there are two types of furnaces that do this, a two-stage and a variable;

“Two stage” furnaces fire at first stage of 60% capacity for a set time (5 to 10 minutes) and then step up to 100% fire, or they can be set for "auto". In "auto" the furnace "remembers" how long it fired the previous cycle to satisfy the thermostat and if that cycle exceeded 10 minutes it will bring full fire on sooner the next cycle. Although the furnace will always be the same efficiency it will waste less when fired at a lower input rate, thereby saving you money on your heating bill.

“Variable” furnaces or boilers will ramp up and down on a wider scale according to the outdoor temperature. The technology on these furnaces has been around for several years and is well proven and dependable; however, variable furnaces use very expensive parts, and can cause problems by their own nature with air pressure on replacement applications where the duct is sized for a high capacity blower, the ramping down of the variable speed motor will cause low pressure in the duct system and result in little to no air flow to long heat runs. Although this is a big ticket item to salesman on commission, we don’t operate that way because it’s not in the best interest of our customer,       Climate-Pro’s Heating & Cooling only recommend “variable” speed furnaces on new homes, where the duct can be sized accordingly and modulating dampers can be utilized to maintain necessary static pressure in the ducting.