This company's unethical and deceptive business practices are well documented both here on Yelp and the Better Business Bureau website, so you would be wise to heed the warnings.
AM PM Plumbing was assigned to us by American Home Shield to look at a leaky water heater. Upon arrival the technician spent no more than 5 minutes assessing the situation and informed the tenant living at the property that the water heater needed to be replaced and that we would need to pay AM PM an additional $300 to cover modifications that would not be covered by my home warranty company. Since they demanded that the money be paid before they would do any work, my husband went ahead and gave them a credit card number.
Once the repair was completed, the tenant notified us that AM PM did not, in fact, complete ANY modifications. They simply installed two flexible water lines that would cost about $10 each at Home Depot and then attached the water heater to the existing stack and wrapped it with duct tape. Clearly, this was not worth $300.
When my husband called to complain that this charge was outrageous considering they didn't make any modifications, the person on the phone said she would wait to charge our card until she could talk to the owner. Well, she proceeded to charge the card right away and never returned our call. Since then, my husband has placed at least 15 phone calls over the past week with absolutely no response from AM PM.
Avoid this company at all costs. As others have recommended, demand a different vendor if your home warranty company tries to assign them to you!