The MOST common types of fuel consumed in modern residential HVAC systems are:
A. natural gas, propane, and oil
B. electric, propane, and oil
C. natural gas, methane, and oil
D. natural gas, propane, and ethanol
The MOST common types of fuel consumed in modern residential HVAC systems are:
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The MOST common types of fuel consumed in modern residential HVAC systems are:
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