I just paid $5K to replace my broke down furnace with a new high efficiency model. Now the contractor is saying that in order for the inspector to pass the inspection, I need to pay $250 for a HERS test to make sure the old ducts don't leak. I'm confused because I was at home when the inspector inspected the installation and he said it passed. He wanted to sign the permit, but my contactor hadn't not given it to me yet. What do you guys say. Is this on the level? Since the price I paid for the furnace install included the cost for permits, should I be responsible for the cost of this test?