Best of luck to you!
You should never put a contract together without the review of the sellers disclosure. If this deal does not work out I would really question your realtor and question the service her or she is providing.
But, since you did put an agreement together and you are in attorney review, I would instruct your attorney that this needs to be negotiated up front before you go under contract. Please remember that you are really not under contract until attorney review is over.
I would not ask them to replace it because they will get the cheapest furnace that is made and that can cause you a whole bunch of problems down the road. I would ask for a credit or reduce the price.
The listing agent s is also going to tell you that Hamilton Township has their own C/O process and they will certify it but don't let them lead you down that path. That inspection is to make sure that it is working today and not tomorrow.
Hope this helps.
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If you need more help and this deal does not work you can contact me and I will make sure you can avoid these issues in the future.
Another idea is to ask for a home warranty - this is insurance coverage that will cover mechanicals (not roof) and appliances. I've seen this built into an offer or added in during the inspection contingency negotiations. The idea is that the seller purchases the policy in your name and it remains in effect for a set period post close - one year, six months.... It is good for "peace of mind" and a great tool for homes that have mechanicals or appliances that may be close to the end of their useful life. At the end of its term, it will be up to you whether to renew that home warranty policy.
Good luck to you!
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