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This crawlspace was not sealed off from the outside. It had a tremendous amount of air moving through it with holes to the outside. We installed a vapor barrier and spray foam on the walls and rim joists.
We peformed an energy audit at this house that was looking for new windows. We additionally installed basement rim joist insulation and a new hot water tank.
What do you do when it's not worth repairing that old furnace? We installed a new high-efficiency Goodman furnace.
We had to install foam board over this stairway to complete the thermal barrier and install cellulose in the attic.