I arrived at a home where the AC wasn't cooling and air was barely coming out of the vents. The problem was a solid block of ice on the indoor coil, caused by a completely clogged air filter that was starving the system for air. I solved the immediate issue by shutting down the system to let the coil thaw and replacing the old filter with a new one. I explained to the homeowner how critical monthly filter checks are, especially in the summer, to prevent this from happening again and to keep their system running efficiently.