High, high desert/mountain of SoCal here. It’s been colder this winter but nothing like the rest of the country. Going down to lows in the 20s this weekend with snow. I pay $3.09/gal and have a 285 gal. tank. They all only fill to 80 percent. That’s all anyone fills it. Something about expansion I think. I paid $600/mo for a fill the last two months. 2600 sf house, central heat/ac, two people. Heat, stove, laundry, water heater on propane. I’m a smidge older now and don’t want to be cold. Thermostat is at 72 during the day and down at night.
I had Amerigas. They were terrible. They cost twice what other companies charge and have phony add-ons imho. I cancelled them a year ago. They still haven’t picked up their tank. I just sent them a “Notice of Abandonment of Property” letter. If they don’t pick it up in a month. It’s mine. Unless you have a contract, you can change your company.
I do take advantage of summer rates and fill up at $2.49/gal. This house is well-insulated. It’s also all windows. Great views - lots of heat transfer. A current project is insulated drapes for the windows and likely a drape for the front door at night. It definitely leaks. If you have a fireplace. Close the damper when not in use. If your stove is propane/gas, you can turn-off the pilot and use an ignition starter. Do clean the furnace filter monthly. I have a washable one. Turn down the thermostat on your water heater. Wash laundry in cold water. Look into getting a larger tank so you can fill up during summer rates.
I’d start with checking out the attic/walls/cellar insulation. Then look at your windows. Dual-pane or triple-pane pay for themselves over time. I do have them in a room addition I did. Love them! I’m going with drapes due to $$.
Look into ceiling fans. You can set them on low to keep warm air circulating. We have central hvac with registers in each room. You can cause harm to your unit if you close too many registers.
I’d go with natural gas in a heart beat. I’ve learned to live with the eccentricities of propane. In summer, my a/c and water costs balance out my propane use in winter.