I have been in the hvac trade for over 25 years,, I have been a contractor the last 15, in my opinion uv lights should be installed in all heating and cooling systems. the benefits far outwiegh the cost of 300.00 a year. I have personally witnessed the benefits of these as well as many of my customers. my customers sell these for me. Today I spoke with a customer who told me she has fought sinus trouble her whole life, (shes 40-50 yrs) I installed a light last year she says she has not had any sinus trouble since the light was installed,, no headaches, no doctor visits, no medications, no missed work because of sinus problems,, and better overall quality of health. She had no problem with the 160.00 I charge to replace the bulbs each year. They do need to be installed properly.
Dwayne Hathcoat