The middle of summer around Asheville looks after itself without any help from equipment. The months that decide whether a pool was worth building are May, September and October, and heating is how you get them.
Why elevation shortens the season
Air temperature is not the limit on a swimming season here, and pool water behaves differently in the mountains than it does anywhere flat. Water temperature is, and the two behave differently in the mountains.
Clear nights at this elevation pull heat out of a pool overnight, faster than people expect and faster than the same pool would lose it in a warmer, damper climate. An unheated pool therefore gives back much of what a warm day put into it, warms up weeks later in spring than a pool at lower elevation, and cools off earlier in fall.
Elevation also varies across the properties we work on. A pool at Black Mountain sits several hundred feet higher than one on the river bottom at Horse Shoe, and the ends of the season are where you feel that difference, not the middle.
What heating actually buys you
A heat pump paired with a cover turns three usable months into five or six. The weeks it buys sit at both ends of the year, which is where they are worth the most, because a September evening with the water at a comfortable temperature is the thing people remember about owning a pool.
Heating does not buy you a better July. What it buys is a May you can use and an October you did not expect to get.

