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To: Eric who wrote (26272)	8/22/2025 1:19:27 PM
From: A.J. Mullen	1 Recommendation Recommended By Eric Respond to of 26717

Many decades. AI Overview: The history of heat pumps stretches back to the mid-1800s, with the theoretical concept laid out by Lord Kelvin in 1852. Peter von Rittinger, an Austrian engineer, is credited with building the first functional heat pump in 1855-1857, initially used for industrial purposes like drying wood and evaporating brine in salt production. Later, in the 20th century, heat pumps evolved to become a viable option for both heating and cooling homes, with advancements in technology leading to wider adoption.