My grandfather paid $25,000 for a new ac unit and ...

My grandfather paid $25,000 for a new ac unit and the warranty just went out in March. The ac stopped working we called them back out to fix it, paid another $1000 for them to say they cleaned coils and changes the capacitor. My husband and I went the very next day and the room temperature 80 degrees and my elderly dementia grandmother with high blood pressure was pouring sweat. We called them back out and they said they couldn t do anything because it was RAINING. We had to rent a motel for my family to stay in. The next day they come out and say it was a PLUMPING problem. My husband took a day off, climbed in the attic and the coils have never been touched. Never again! Considering calling a lawyer.