Labor Day may mark the unofficial end of swim season, but for many pool owners, the fun doesn’t stop just because the calendar says summer is over. Families in warm regions like Florida, Texas, or Southern California often swim well into the fall. Even in cooler climates, plenty of homeowners want their pools open for late-season parties, exercise, or just the joy of a brisk swim. The problem is that when water dips just a few degrees too low, even the most dedicated swimmer hesitates. That’s when pool heaters come in—and for many service pros, fall is the perfect time to talk to customers about them.

A reliable heater can mean the difference between squeezing two or three extra months out of a pool and letting it sit idle. But here’s the catch: many existing heaters have been sitting untouched since spring. After months of dormancy, it’s common for pests to nest inside units, damaging wiring and insulation. Even if the equipment fires up, older models — especially those more than 10 years old — often run at a fraction of their original efficiency. That wasted energy shows up on the utility bill, and customers who lived with it in the past are increasingly open to modern, energy-saving options today.

To understand why “new” matters, it’s worth revisiting the heater landscape. Four primary types dominate the market, each with strengths and drawbacks:

• Gas heaters: Long the industry standard, these powerful units heat water quickly and on demand. They’re perfect for spas and pools that are occasionally used because they don’t require long warm-up times. The downside is fuel cost — natural gas and propane aren’t cheap — and growing regulations in some states make gas appliances harder to install or replace.

• Heat pumps: These units create heat indirectly; they capture warmth from the air and transfer it into the water. This makes them highly energy-efficient, especially in regions where temperatures stay above 50–55°F. They excel at steady, economical heating but can’t match the rapid heat-up of gas.

• Electric resistance heaters: These are essentially giant toasters for pool water, using electrical resistance to generate heat. They’re simple and effective for small bodies of water, like spas, but costly to run for fullsize pools because of high electricity demand.

• Solar heaters: By channeling water through solar collectors, these systems harness solar energy. They’re environmentally friendly and have relatively low operating costs once installed, but depend entirely on sunlight and require large collector areas — making them less practical in shaded backyards or cloudy regions.

Each of these heater types has a niche where it shines. For service pros, the trick is helping customers balance their climate, budget, and swimming habits against the strengths of each system.

Energy costs are climbing, while environmental regulations are tightening and many municipalities are rethinking gas infrastructure altogether. That means the “same old” heater isn’t always the right answer anymore. Customers who may never have considered alternatives are now asking questions about efficiency, operating costs, and sustainability.

For service professionals, this moment is an opportunity. Explaining how today’s high-efficiency models can slash bills, extend seasons, and reduce environmental impact is a powerful sales tool. It also positions you as a forward-thinking expert rather than someone simply swapping out old equipment.

This special issue of Service Industry News digs into the latest heater technologies that are reshaping the market — from inverter-driven heat pumps to hybrid gas-electric units and advanced refrigerants. Each innovation comes with its own set of advantages and challenges. This issue provides the talking points and technical background to recommend upgrades that make sense for your customers’ lifestyle and budget.

When it comes down to it, no one wants to stare at a perfectly good pool and decide it’s “too cold” to use. A well-chosen heater keeps the water inviting — and keeps your customers swimming longer, happier, and more affordably than ever before.