I was called to a home to replace a furnace that was unsafe to run. The furnace was over 20 years old and had been causing the home's temperature to fluctuate. I removed the old furnace and installed a new one, ensuring that it was properly vented and connected to the gas line. I also checked the electrical wiring and ensured that it was up to code. The homeowner was very pleased with the work and thanked me for my professionalism.