Ehlers Heating and Air Conditioning review: It was still cold inside the house and furnace hasn't been repaired 1

I called to Ehlers Heating and Air Conditioning. Their sent the repairman, who fixed the furnace and when I asked how much time it would need to warm the house, he told me 6 hours. He set the thermostat on 60 degrees and told that it would be enough. When I returned home next day, it was colder than the day before. When I called to the repairman, he said that he was too busy and couldn’t come. He didn’t know why it was still cold in the house.