Proper sizing for furnace

The size of the furnace is based on a lot more than square footage

I’ve been researching new furnaces. I’ve learned about the advantages of higher AFUE ratings, adaptable-speed technology and zone control. Most of the top manufacturers offer similar features, efficiency levels and warranties. From what I’ve read, the most important aspect of furnace installation is the integrity of the contractor. There are HVAC contractors who provide a quote for a top-of-the-line model and then install a much cheaper furnace. There are those who don’t take the time to properly size the heater. They either replace the old unit with one of the exact same size or oversize the furnace. Since the installation of our current furnace, we’ve made quite a few home improvements. We’ve replaced windows and doors, added attic insulation and torn down walls to open up our space. We probably don’t need as big of a furnace as we once did. A larger furnace costs more and won’t provide better performance. A furnace that is too big for the demands of the house will reach the desired temperature too quickly. It won’t have the opportunity to achieve optimum efficiency levels. It might short cycle, causing unpleasant temperature fluctuations. The continual starting up and shutting down accelerates wear and tear, leading to more frequent repairs and shorter lifespan. I started looking for a contractor who uses the recommended Manual J calculation to determine the ideal size of heating system. The size of the furnace is based on a lot more than square footage. The number of windows and doors, number of floors, color of roof, amount of sunshine, occupancy and climate all factor in.
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