What issue might arise from using the wrong size gas furnace?

Using the wrong size gas furnace can lead to inadequate heating and reduced efficiency. A furnace that is too small for a space will struggle to reach the desired temperature, causing it to run constantly and leading to discomfort for occupants. This constant operation can also increase wear and tear on the unit, potentially resulting in more frequent repairs and a reduced lifespan.

On the other hand, an oversized furnace can heat a space too quickly, resulting in temperature fluctuations and failing to remove humidity effectively. This can contribute to an uncomfortable environment, as well as potentially leading to higher energy bills due to the inefficiency of short cycling, where the furnace turns on and off too frequently. Therefore, the importance of selecting the correct size for a gas furnace is crucial for ensuring proper home comfort and operational efficiency.