Diamond Heating and Cooling installed two furnaces and an air conditioner in a duplex for me. The old furnaces were becoming extremely costly, since the house is about 50 years old. When they came, they explained the different systems and gave me options. I decided not to go with the electric heaters and go with the gas heaters instead because they would save me money. When they left, they put things back neatly. Overall, they were nice people to deal with. I would recommend them because they were very honest and they explained things, which made me feel much better about the situation.