We have used Southside Heating and Air Conditioning for years now. We had the heat go off. The guy that answered phone said there were no appointments until the next day. It was a really cold day, and he said it was important that he stop by and bring us some heaters. He dropped by on his way to work, and he found that we turned the thermostat from heat to cold. He didn't charge us a penny. I recommend them because they're reliable.