I am a highly skilled and experienced home service professional with over 10 years of experience in the industry. I recently completed a job for a client who had a Goodman heating and cooling system that was not working properly. The furnace heater was not producing heat, and the air filters needed to be changed. I arrived at the client's home and began the repair process. I first checked the furnace to determine the cause of the problem. I found that the gas valve was not opening, which was causing the furnace to not produce heat. I replaced the gas valve and tested the furnace to ensure it was working properly. Next, I changed out the air filters. The air filters were dirty and clogged, which was causing the furnace to not produce heat. I replaced the air filters with new ones and tested the furnace again to ensure it was working properly. After completing the repair, I tested the furnace to ensure it was working properly. The furnace was producing heat and the air filters were cle