The service technician overcharged me by 1.25 hours the first time they came. I phoned head office and they checked their records of the GPS movement of their service van and agreed, they repaid me 1 hour only. The second time they replaced the whole unit and again the service person billed for an extra hour after he left. I complained again and they reimbursed me half an hour only! The service technician is over-billing and pockets your money!!! He did not make me sign anything when he left, so if you use this company, make sure you sign the invoice with the TIME written on it before the technician leaves your house!!!!!