A gas furnace installed at altitudes above what height needs adjustments to operate properly?

Gas furnaces are designed to operate efficiently at specific atmospheric pressures that correlate with sea level conditions. As altitude increases, atmospheric pressure decreases, which can lead to a variety of performance issues with gas appliances, including improper combustion and reduced efficiency.

Furnaces installed at altitudes above 2,000 feet require adjustments to function correctly. These adjustments typically involve modifying the gas input and ensuring that the furnace can effectively mix gas with air for combustion at the lower pressure found at higher elevations. Without these adjustments, the furnace may burn fuel inefficiently or struggle to maintain the necessary heat output, potentially leading to increased emissions and unsafe operating conditions.

Understanding the implications of altitude on combustion is crucial for both safety and efficiency in heating systems. For installations above 2,000 feet, it's critical to consult manufacturer specifications and guidelines to ensure a safe and effective setup.