Natural gas is one of the most economical sources ... If a repair will cost more than 50 percent of the remaining value of your furnace, then replacement is a good idea. If the cost is less ...

A new federal rule sets updated energy efficiency standards for tankless gas water heaters by 2029 — but it doesn’t ban them.

That new rule would eventually marginalize noncondensing furnaces that aren ... a decade to recover their replacement costs.” An AGA study found that natural gas used in a baseline new home ...