Response for credit at closing for results of Home Inspection

There is no simple "proper legal response" - all that you need do is send a letter indicating that you will not be providing a credit and that you are selling the house in "as is" condition. If the buyer is dissatisfied with that response, he/she will then have the option of canceling the contract unless the contract provides otherwise.

Disclaimer - This answer is given based on the specific information provided and does not constitute the creation of an attorney-client privilege. You should consult with an attorney before taking any legal action.