My house has a unfinished crawlspace and last summer while fixing my blown pipe I saw that the return of the heater has a big hole. The main return is under the house and is made of
black plastic insulated material. Can I run my heater and just totally cover the main return? Because I can smell the odor under the house of damp soil when the heater runs. I thought of covering the hole, but i haven't check the lenght of the return if its still ok. I'm thinking yo let somebody fix it but it might cost a lot especially its a dirty crawlspace.
Help me please.