Lafferty Heating offered an estimate for an inline HEPA filter over 2 years ago and I finally acted on it. The pretty much re-affirmed the price with minor increase. I also added /inspection/maintenance of my 22 yr old furnace. The work was performed on time and within thae agreed to amount. Workers were timely, cleaned up after themselves and I really liked the final product. We agreed after the inspection that I should replace my furnace in about two years. I will certainly use Lafferty Heating for that task.