🔥 Your Current Heating System
❄️ Your Current Cooling System
🌡️ What a More Efficient System Does for Comfort
What Makes One Furnace More Efficient Than Another?
An older furnace burns fuel and sends the hot exhaust gases out the flue — along with a significant amount of heat. A standard furnace from 1990 might convert only 65–70% of its fuel into useful heat, wasting the rest up the chimney.
A modern high-efficiency condensing furnace has a second heat exchanger that pulls even more heat out of those exhaust gases before they leave. So little heat escapes that the exhaust comes out as water vapor rather than hot gas — which is why these furnaces vent through plastic PVC pipe out the side of the house instead of a metal flue through the roof.
The same principle applies to air conditioners: newer systems use better compressor technology and refrigerants that move more heat per unit of electricity. A system from 2003 might use twice the electricity of a modern high-efficiency unit for the same cooling output.
Common Questions
Should I fix my insulation and air leaks before replacing my HVAC?
Yes, in most cases. Improving the building envelope first reduces your home's heating and cooling load — which means you may need smaller, less expensive equipment. A tight, well-insulated home also lets any system run in longer, more efficient cycles that deliver better comfort and humidity control.
What is a condensing furnace?
A high-efficiency furnace that captures heat from exhaust gases that older furnaces waste. You can spot one because it vents through a plastic PVC pipe out the side of the house rather than a metal flue through the roof. These units are typically 95–97% efficient — meaning only 3–5 cents of every fuel dollar goes to waste.
What does "right-sizing" mean and why does it matter?
Right-sizing means choosing equipment whose capacity matches your home's actual heating and cooling needs. Oversized equipment short-cycles — it turns on and off too quickly, delivers uneven temperatures, wears out faster, and does a poor job of controlling humidity in summer. Ask your contractor about a Manual J load calculation before buying new equipment.
What about heat pumps — are they better than gas furnaces?
In most climates, modern heat pumps are significantly more efficient because they move heat rather than create it. In mild and moderate climates, a heat pump can deliver 2–3 units of heat for every 1 unit of electricity used — far more efficient than any gas furnace. In very cold climates, a dual-fuel system (heat pump plus gas backup) often delivers the best combination of efficiency and reliable warmth.