In this case, they technically might be able to force you to make their rent include electric for the time the furnace was on their line.If they're a new tenant, and you're in one of those states, I'd probably just eat the electric bill for the first month or whatever while it gets fixed.

How much impact will Coronavirus have with real estate? 

Please take a moment to review the following and consider the impact on your expenses and the wear/tear on the property:https://www.nolo.com/legal-encyclopedia/adding-roommate-lease-or-rental-30187.htmlIf the roommate passes the application and screening, you definitely want them to be on the lease as fully responsible for the entire lease and rent.

Would this significantly impact returns come year 7 if tenants decide to leave?

@Mike McCarthy and @Chris Mason Thank you so much both for your responses.Fast forward to the future, should I fix this discrepancy after closing the deal to reduce my Taxes or it is going to impact me negatively when I decide to renew rentals or sell this property?

There are (was) two goals:1 - Financial Goal:  This is what should be the initial driving force as to why you do REI in the first place. 

Check to see how it impacts your cash on cash return which will give you a much better idea of which option appeals to you more.Best,Paul

Have patience and the relationships and the  deal will come unfortunately there really is no good way to force something to happen.

As per switching to forced air, it really depends how the building is set up. 

Also your agent may be able to force it to not be in active in the MLS until the EMD is agreed on between you both because there is a contract on it.Good Luck