Insulation Question for Rental

[Caleb Smith]

I currently have a tenant that has reached out about the temperature in the home being too cold.

When I called a company to check the furnace, they did a quick cleaning and said everything was working fine.

The second time the resident called about the temperature, I decided to buy space heaters as I thought that would be beneficial and help him out.

However, the temperature in the house continues to be a problem from their perspective.

When I called an insulation company, they are suggesting over $4,000 worth of insulation costs, which I thought was very high. This amount included the attic, exterior walls and crawl space.

So my question is, what should I do next? If I go the insulation route, is there a part of the house where having extra insulation would help the most?

Otherwise, is there another route to take that would help in this situation?

I want to help the tenant, but also keep costs at a reasonable level.

I appreciate any advice in this situation.