The real cost of electricity, natural gas, chemicals, and maintenance for a 15,000 gallon pool.
So you've decided you want a swimming pool. You've picked out the design, found the perfect water color, and started imagining yourself floating around on a Saturday afternoon with absolutely nowhere else to be.
Then comes the question nobody really thinks about until they're ready to build.
"How much is this thing going to cost me every month?"
Fair question. You're already spending a good chunk of money building your backyard paradise. The last thing you want is another utility bill that makes you question your decisions.
Fortunately, modern swimming pools are considerably more efficient than they used to be. And with the right equipment, the monthly operating costs might be less than you expect.
Let's break it down.
First, Let's Make a Few Assumptions
For this example, we're using a typical 15,000 gallon swimming pool in the Austin area, equipped with Jandy variable speed pumps and, if heating is involved, a Jandy natural gas heater.
We're assuming:
Electricity costs approximately $0.15 per kilowatt-hour.
Natural gas costs approximately $2 per therm.
The pool holds 15,000 gallons of water.
An attached spa, if included, holds approximately 500 gallons.
The homeowner handles routine maintenance.
Now, before anyone starts comparing utility bills, these are rough estimates.
Electricity and natural gas rates vary depending on your provider, where you live, and the time of year. Pool size, weather, equipment settings, and how often you actually use your pool all play a role.
We're simply trying to give you a reasonable idea of what pool ownership might cost.
What Does a Pool Cost Without a Spa?
Let's start with a basic 15,000 gallon swimming pool without a spa or regular heating.
Here's a rough breakdown of monthly expenses:
Electricity: $20 to $50
Pool chemicals: $30 to $75
Water replacement: $10 to $30
Cleaning supplies: $10 to $30
Estimated monthly total: $70 to $185
For someone maintaining their own pool, around $125 per month is a reasonable starting budget.
The biggest factor in keeping electricity costs down is the circulation pump.
At Austin Dreamscapes, we use Jandy variable speed pumps, which allow the system to circulate water at lower speeds instead of running full blast all day.
Think of it like driving your truck around Austin. There's a pretty big difference in fuel consumption between cruising down the road and keeping your foot on the floor everywhere you go.
Your pool pump works on a similar principle.
What If You Add a Spa?
Here's where things get interesting.
Adding an attached spa doesn't necessarily mean doubling your operating costs. Most attached spas share the pool's filtration equipment, so when the spa isn't being heated, the additional expense is relatively small.
But nobody builds a spa just to sit in cold water.
Let's assume you have a 500 gallon spa with a Jandy 400,000 BTU natural gas heater.
Heating that spa from 70°F to 100°F requires roughly $3 in natural gas under ideal conditions, using our assumed gas rate.
Of course, we don't live in ideal conditions. We live in Texas, where the weather can change its mind three times before lunch.
Accounting for heat loss and the time you spend enjoying the spa, budgeting around $5 to $10 per evening is a practical starting point.
Here's what that might look like:
Heating the spa once: $5 to $10
Heating the spa four evenings per month: $20 to $40
Heating the spa eight evenings per month: $40 to $80
Heating the spa twelve evenings per month: $60 to $120
If you use your spa eight evenings a month, your total pool and spa operating expenses might land somewhere around $120 to $285 per month.
Not bad for having your own hot tub waiting in the backyard.
What Does It Cost to Heat the Entire Pool?
Now we're talking about a different animal.
Heating 500 gallons of spa water is one thing. Heating 15,000 gallons of swimming pool water is another.
Using a Jandy natural gas heater and our assumed $2 per therm gas rate, here's approximately what it takes to raise the temperature of the entire pool:
Raise the water temperature 5°F: Approximately $15
Raise the water temperature 10°F: Approximately $30
Raise the water temperature 15°F: Approximately $45
Raise the water temperature 20°F: Approximately $60
Keep in mind, these numbers represent the energy required to increase the water temperature before accounting for heat loss.
And that's an important distinction.
Heating your pool from 75°F to 85°F for a weekend is very different from trying to maintain 85°F water throughout December.
Wind, evaporation, overnight temperatures, and whether you use a pool cover can dramatically affect how often your heater needs to run.
If you're planning to heat your swimming pool regularly during the cooler months, natural gas can easily become your biggest operating expense.
We're talking potentially several hundred dollars per month, sometimes considerably more.
That's why it's worth discussing heating options during the design process, especially if extending your swimming season is important to you.
Let's Compare the Monthly Costs
Here's what our hypothetical 15,000 gallon swimming pool might cost depending on how you use it.
Pool only, no heating: $70 to $185 per month
Pool with spa, no heating: $80 to $205 per month
Pool with spa, heated eight evenings: $120 to $285 per month
Pool with occasional pool heating: $150 to $400 or more per month
Pool heated regularly during cooler weather: $300 to $800 or more per month
These are rough monthly planning estimates, not guaranteed costs or measured averages. They assume you're maintaining the pool yourself and exclude professional pool service, major repairs, equipment replacement, and any additional fixed utility charges.
Why We Use Jandy Equipment
At Austin Dreamscapes, we exclusively install Jandy pool equipment.
And there's a reason for that.
The equipment you choose during construction can affect your monthly operating expenses for years to come.
Modern Jandy variable speed pumps allow us to program circulation speeds based on what the pool actually needs, rather than running everything at maximum power all day.
We also install Jandy automation systems, which allow homeowners to control their equipment directly from their phones.
Want to turn on the spa before you get home? Adjust the pump schedule? Fire up the water features when friends come over?
A few taps on your phone and you're in business.
It's convenient, but more importantly, properly programmed equipment can help avoid unnecessary energy consumption.
What About Pool Maintenance?
Some homeowners enjoy taking care of their swimming pools. Others would rather spend their weekends doing just about anything else.
If you're handling the maintenance yourself, your primary expenses will be chemicals, water, electricity, and occasional cleaning supplies.
If you'd rather hire a professional, weekly pool service in the Austin area might add approximately $150 to $250 or more per month.
Some companies include chemicals in their pricing, while others charge separately, so it's worth asking exactly what's covered.
Either way, a properly designed pool with good circulation and filtration should be easier to maintain than one with poorly planned plumbing and equipment.
The Bottom Line
Owning a swimming pool doesn't have to be expensive.
For a typical 15,000 gallon pool with efficient equipment, budgeting around $125 per month for basic operation is a reasonable place to start.
Add a spa, and your expenses increase depending on how often you heat it. Heat the entire swimming pool regularly, especially during colder weather, and your natural gas bill becomes a much bigger part of the equation.
At Austin Dreamscapes, we believe these conversations are just as important as choosing your tile or deciding where the tanning ledge should go.
Because a beautiful pool is great.
A beautiful pool that's easy to maintain, efficient to operate, and doesn't surprise you with an outrageous utility bill? Even better.
Thinking about building a swimming pool in Austin or the surrounding Central Texas area?