We do that in our house. Gas bill is roughly $1,200 USD that I prepay in the summer. My house does not hold heat at all. I keep the thermostat at 63°F. I’m cheap on utilities. In the summer we keep the windows open and run tower fans on occasion, but if it gets real humid I’ll kick the AC on.
Maybe time to look into upgrading insulation or house wrap.
Our last house had hail damage, so we had the siding replaced. We opted for a foil backed bubble wrap under the new siding. Holy smokes!!! Kept the house cooler in the summer, held in the heat in the winter. Cut down on drafts as well. I ended up repainting the inside of the house, took all the window trim off. Discovered there was absolutely no insulation between the window and studs, you could see the plywood sheeting.
Spray foamed all that, and when I put the trim back on, ran a small beed of caulking around as well. It tightened the house up enough that you could feel the draft now finding it's way in through the outlets on the outside walls. So had to pull them and put insulation sleeves around the boxes. Those few things definitely dropped our natural gas consumption big time.
In the new house it's windows and fans as well, they want about 8 grand for central air. Would love it, but hard to justify that cost for the amount of truly unbearable days of heat we get.
But they are getting more and more each year. So maybe down the road we will get it.