Replacing Your Furnace

What is high efficiency Furnace?

A high-efficiency furnace provides your home with ideal heating comfort while using less energy than other models. High-efficiency furnaces are designed to extract additional heat from natural gas, condensing the flue gases in the process. Also known as a condensing furnace.
    

what is the difference between mid-efficiency and high-efficiency gas Funaces?

The efficiency ratings of furnaces is measured in AFUE as a percentage. AFUE stands for Annual Fuel Utilization Efficiency, and it’s what furnace manufacturers use to inform us of the efficiency of their equipment. Standard efficiency gas furnaces have efficiency rating of 60% to 70%. Mid-efficiency gas furnaces have an AFUE rating of around 80%. High-efficiency gas furnaces (aka condensing gas furnaces) have efficiency ratings in excess of 90%
   

What are the differences in singer-stage, 2-stage gas furnace?

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.