Its about 100 years old but its a double brick home so its decently insulated.

Have you ever dealt with this and if so have you found any physical solutions that aren’t overly expensive (thicker padding for carpet, certain insulation, etc)Thanks!

Before I did that I would have blown insulation put into the cavity between the upstairs & downstairs.

Thanks for the suggestions and additional resources, unfortunately it’s not move in ready so we will have to rehab a bit, at least flooring, kitchen also needs a gas line repair and possibly some insulation.

I use cellulose insulation blown into the joists space in the ceilings of the basement unit.

I suggest that you add blow-in insulation to the attic space to bring the R-Value up to modern building code standards.  

I would add insulation to the walls before adding drywall. 

Mobile homes are expensive to heat and cool, as they're not usually very well insulated and they are basically a SFR - which are more expensive to heat and cool than an apartment.

Look at the insulation in the attic, look at your soffits to make sure you're getting enough airflow through the roof.

If you can get connected with the people that are insulated from these markets you'll be solid.Eventually, we'll return to a place where affordability rises again.