I bought this house exactly 5 years ago and never had any probems with AC until this morning. The burglar alarm went on for no reason and it stayed on for good 20 minutes. We could never figure how to turn it on. Anyways, our AC is not turning on now...could it be an electrical malfunction? I have two units, one upstairs one down stairs and none of them work. Please help it is getting reallly bad and I have a 4 year old and a 2 year old. Thanks.