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Proud supplier of Trane and Carrier Furnaces
What are the advantages of units with variable speed fans?
Variable speed fans operate on a simple principle: they are able to spin at different speeds depending on the heating and cooling needs of your home. Usually, they operate at lower speeds, delivering a steady, reliable stream of warm or cool air to your home. This helps control humidity levels, utility costs and system noise. When conditions become more extreme, the fan speed increases so that the system can meet increased demand, guaranteeing that on even the hottest days or coldest nights, you’re comfort needs will be met.
What are the differences in a single-stage, 2-Stage, and variable-speed gas furnaces?
A single stage furnace will deliver the same amount of heat and airflow no matter what the temperature is outside. A 2-stage furnace with a 2-stage thermostat will begin in first stage (low burner, low airflow) and only go to second stage if the indoor temperature drops during first stage. This makes the furnace run longer, providing greater air circulation, temperature distribution, and air filtration. This also provides a more consistent indoor environment. The second stage will only come on when the need is there and then it will be able to run longer and maintain the comfort level. The more your system starts and stops, the less control you will have of your home's environment - and the less efficiently it works, partly due to duct heat loss. The advantage of a 2-stage, variable-speed furnace is it has an Enhanced mode. This allows the coil to cool quickly and the blower to slowly ramp up and ramp down or operate at 50 percent of the cooling air speed in the FAN ON position. This provides greater humidity control, quieter operation, and maximum air circulation, temperature distribution, and air filtration.
What do all those rating numbers mean?
The federal government requires all air conditioning and heating equipment to be rated for efficiency. The higher the rating, the more efficient the model will be.
Gas furnaces are rated for AFUE (Annual Fuel Utilization Efficiency). This defines the amount of heat used to warm your home from the burned fuel. A 90% furnace will use 90% of the available heat to heat your home. 10% of the heat is vented outdoors. Many older gas furnaces are only 50 or 60% efficient. The other 50 - 40% is vented outdoors. You can see that a new high-efficiency furnace will require much less fuel to heat your home.
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