Quick Answer
Monthly pool costs depend on your equipment, pool type, and habits more than any single average number. Electricity, especially the pump, and heating are usually the largest ongoing costs, with chemicals, water top-off, and seasonal opening and closing adding smaller amounts, plus a long-term resurfacing reserve for gunite owners.
- Variable-speed pumps run at a lower, efficient speed most of the day and can cut pump electricity use significantly compared to older single-speed pumps.
- Saltwater systems generate chlorine on-site, shifting the ongoing cost away from buying chlorine but still requiring salt, cell maintenance, and balanced chemistry.
- Gunite plaster finishes typically need refinishing every 10 to 15 years, and pebble or quartz finishes every 15 to 25 years, a cost worth budgeting for in advance.
- Fiberglass pools generally cost less to run than gunite pools because the smooth gelcoat surface resists algae and demands less chemical use.
What is the biggest factor in a pool's monthly running cost?
Heating, when you run it, swings the number more than anything else. Pump electricity is usually the next largest cost, and a variable-speed pump meaningfully lowers it.
Is a fiberglass or gunite pool cheaper to maintain?
Fiberglass is generally cheaper to run day to day because its smooth surface needs fewer chemicals and never requires the periodic resurfacing that gunite plaster does.
The Short Answer
Running a pool costs real money every month it is open, but the number depends heavily on your equipment, your pool type, and your habits, more than on any single "average" figure you will find online. Most owners with a well-equipped pool land in the low hundreds of dollars per month during swim season, less with efficient equipment, more if they are heating aggressively. Here is what actually drives that number.
Electricity: The Pump Is the Big Line Item
The pool pump runs more hours than almost any other appliance in your house, so it is usually the largest slice of a pool's operating cost. This is also where the biggest savings sit. A variable-speed pump, which runs at a low, efficient speed most of the day instead of a single high speed around the clock, can cut pump electricity use dramatically compared to an old single-speed pump. If you are upgrading equipment on an older pool, this is one of the highest-value changes you can make; see our pool renovation options.
Chemicals: Salt Shifts the Mix, It Does Not Eliminate the Cost
A traditional chlorine pool means buying chlorine regularly along with balancers. A saltwater system generates chlorine from dissolved salt, so you are not hauling jugs of chlorine, but you still need to maintain the salt level, replace the cell eventually, and balance pH and alkalinity. Salt systems generally shift and simplify the ongoing cost rather than making pool care free. We cover the real tradeoffs in saltwater vs. chlorine.
Water: Topping Off Through a Tennessee Summer
Evaporation and splash-out mean every pool loses water, and it is more noticeable during hot, dry stretches of a Tennessee summer. It shows up on your water bill, but for most homeowners it is a minor line compared to electricity and heating.
Heating Is the Biggest Variable, by Far
Of everything that affects a monthly pool budget, heating swings the number the most, and how much depends on the type of heater, how many degrees you are raising the water, and how many months a year you run it. Rather than guess at a number here, we break down gas, heat pump, and solar heating, and what each actually costs to run in East Tennessee, in our pool heating guide.
Opening and Closing: A Seasonal Cost, Not a Monthly One
Most East Tennessee pools get opened in spring and closed for winter, and both of those are service visits with a cost attached. Budget for this once or twice a year rather than folding it into your monthly number.
The Long Game: Your Resurfacing Reserve
The cost that is easy to forget is the one that shows up years down the road. A plaster gunite finish typically lasts 10 to 15 years before it needs refinishing, and pebble or quartz finishes run 15 to 25 years. That is not a monthly bill, but it is a real future cost worth setting aside for, especially if you own a gunite pool. See what that actually involves in our pool renovation cost guide.
Fiberglass vs. Gunite: The Ongoing Cost Difference
This is where pool type matters as much as equipment. A fiberglass shell has a smooth, non-porous gelcoat surface that resists algae and does not demand the same chemical load as a gunite pool's more porous plaster finish. Fiberglass owners generally spend less on chemicals and never face a resurfacing bill, since the gelcoat is not a wear surface the way plaster is. Gunite gives you more design freedom, but the honest tradeoff is a bit more upkeep and that future resurfacing cost. We lay out the full comparison in fiberglass vs. gunite.
What This Means for Your Budget
Nobody can hand you an accurate monthly number without knowing your equipment, your pool type, your heating habits, and how many months a year you run it hard. What we can tell you honestly: a variable-speed pump and a fiberglass shell both lower your ongoing cost, heating is the single biggest lever, and a resurfacing reserve is worth planning for from day one rather than being surprised by it in year twelve.
If you are still deciding what to build, run the numbers with our instant estimator or request a free consultation, and we will talk through equipment and long-term costs honestly, not just the day-one price.
