Is a steady 65°F better than 50°F>70°F for 12hours overnight and completely off during the day? 35°F ambient

Hello, I am not good at math and not sure what HVAC calculators to use since the ones on google don't seem to fit what I am asking.

I have a 1800sq ft home 2 story with basement (3 story?) Townhome (three exposed sides) in Southern New jersey with Average efficiency/ heat loss and gas costs. I spend average about 1300 in gas every year.

I am wondering which is better. I keep reading that a steady 65°F is more efficient but testing it out on my bill seems to prove otherwise.

1- Turning off my Heating system and only having it on from 6pm to 4am. ~10-12 hours run time. It takes about 3-4 hours for my home to go from 54°F-69°F.

2- Letting it sit at 65 all day maybe change it to 60 when I'm gone.

3- Keeping my house at 50°F and running two 1500watt space heaters in a 15ftx12xft and a 20ftx18ft bedrooms for 10 hours. Electric cost about ~22-25 Cents per KWH (service+transmission costs) roughly $130-$200 per month year round occasional $250.

I normally do the first option if it gets too cold and my home usually sits at 45°F-55°F when outside ambient is 30°F-40°F. I use about 40-50 Therms from April-November. and ~170-200 Therms December-March. January bill around $200 vs July bill around $60. Which I think Averages to a dollar per Therm.

If anyone could help with these calculations or provide me the correct equations and advice thank you.

For everyone curious how I survive in a 50°F home. I have an inside only set of winter wear I change into when I get home from work either waiting for the temp to reach 70°F or just sleep with it being 50°F.I only keep it at 50°F to keep my pipes from freezing otherwise I'd probably not have the heat on at all. When I know I'll have guest over I'll turn it on for them.