We live in Far North Dallas with a heated pool/spa. We have a year old Westie that loves playing ball while we are in the pool and she loves a swim when she starts to get hot from running around. In the last year, we heated our pool more than ever (beginning in March and well into November). In short, we love being able to heat the pool. In November, I feel like the pool became our oversized spa!
We heat the water so the water temp ranges between 86-90 degrees...just depends on what we want.
Natural gas bills during Fall 2019
November 2019 - $178 (heated during first two to three weeks, but not every day)
October 2019 - $278 (heated almost every day)
September 2019 - $114 (heated from time to time to adjust water temp)
Average gas bill is $65. During the summer a typical gas bill is $35. (Other than the pool heater, the only gas appliances we have are a water heater, central heat unit, and fireplace.)
Pool heater: Raypak 400k unit (
Raypak - Pool/Spa Heaters, 206A-406A)
To predict whether it would be a good day to heat the water, we decided a forecast high temperature of 60 degrees would be the minimum. A sunny day with a forecast high of 60 is doable. A windy, overcast day with a high of 60 is not as fun. Once the high (air) temperature consistently hit the 50's, the wind became a negative factor. Also, a north wind on a 60 degree day feels much colder than a southerly wind. Our pool is on the sunny, south side of the house and relatively protected from winds by a tall fence. While we are protected from much of the wind, it can be noticeable on cooler days.
Another factor was the water temperature when the pool is not being heated. Once the water temperature consistently fell below 68 degrees, it would take an excessive amount of time to heat the water, so we would not heat the water.)
We have a spa and rarely use it. Our Westie uses it more than us. It's probably been two years since we have used just the spa during the winter.
Our pool was built in 1998. We replaced the heater in 2015.