Choosing Between Heat Pump and Gas
Pool heating is essential in LA if you want to swim year-round. But should you go with a heat pump, gas heater, or both? Let me break down the real-world differences for Southern California pools.
How Each Works
Heat Pump
Extracts heat from outdoor air and transfers it to pool water. Works like an air conditioner in reverse. Efficiency depends on air temperature—works well when outdoor temps are 50°F+.
Gas Heater
Burns natural gas or propane to heat water directly. Heats quickly regardless of outdoor temperature. Uses combustion, so there's ongoing fuel cost.
Cost Comparison
Upfront costs:
- Gas heater: $2,500-$4,500 installed
- Heat pump: $5,000-$10,000 installed
Operating costs (heating to 82°F in typical LA conditions):
- Gas heater: $150-$300/month when heating regularly
- Heat pump: $50-$120/month when heating regularly
Over 10 years, the heat pump's lower operating cost typically more than offsets its higher purchase price.
Performance Differences
- Heating speed: Gas is faster (can raise temp 1-2°F/hour vs 0.5-1°F/hour for heat pump)
- Cold weather: Gas works in any temp; heat pump efficiency drops below 50°F
- Efficiency: Heat pumps are 500-600% efficient; gas is 80-95%
- Lifespan: Heat pumps last 15-20 years; gas heaters 8-12 years
💡 Pro Tip
In LA's mild climate, heat pumps work efficiently almost year-round. The few cold nights aren't enough to make gas necessary for most homeowners.
Title 24 Implications
As of 2026, California's energy code requires heat pumps or solar as the primary heating source for new pools. If you're building new, you'll have a heat pump anyway. Gas can be added as backup if desired.
When to Choose Each
Heat Pump Makes Sense When:
- You want to minimize ongoing costs
- Environmental impact matters to you
- You're building new (required by code)
- You maintain consistent pool temperature
- Your pool is in direct sunlight
Gas Heater Makes Sense When:
- You heat occasionally (weekends only)
- You need rapid heating (guests coming)
- You want a backup for cold snaps
- Budget is tight on equipment
- You have a spa that needs quick heat
The Combination Approach
Many clients install both—heat pump as primary, gas as backup. The heat pump maintains temperature efficiently, and gas kicks in when you need faster heating or during cold weather.
We have both but rarely use the gas. The heat pump keeps the pool perfect all year for about $80/month. — Jennifer L.
Frequently Asked Questions
Which is cheaper to operate in LA—heat pump or gas?
Heat pumps cost 50-70% less to operate in LA's climate. Expect $50-$120/month vs $150-$300/month for gas.
How fast do heat pumps heat a pool?
About 0.5-1°F per hour vs 1-2°F per hour for gas. Heat pumps are slower but more efficient.
Can I have both heat pump and gas heater?
Yes—many homeowners use heat pump as primary and gas as backup for rapid heating or cold weather.
Do heat pumps work in LA winter?
Yes—LA winter temperatures rarely drop below 50°F, which is within heat pump operating range.
