HDPattaya

I think it depends on the type of cleaning. I have used the sprays etc. and periodically clean the filters. I found that when I get mine done properly it costs about 1400 a unit but this is complete removal of the evaporator (inside unit) and spray cleaning of all the parts new gas etc and additionally I get them to use a rust inhibitor and spray Rust-Oleum primer on metal parts. (usually around the frame areas) the I have 7 and it takes a good part of the day with about 4 to 5 guys. I install or have them insert some condensate drain pan rust/ biological growth inhibitor https://www.airstarsupply.com/products.aspx?cat=29

I think people are talking about different kinds of service here so I would like to see what exactly they get done.

I have used many and found: Typically people place the outdoor ones in the wrong places and it attracts the bugs to the location they do not want the bugs. All the big zappers I have used have a short life span outside. Yes the CO2 works a tad better. Best to place then away from doors and places you sit etc. Use replants in the door and populated areas. Best easy repellent is the fragrant lemon grass. I keep potted ones at the doors. Inside the house I use cheap wall plug bug zappers: https://www.lazada.co.th/products/pest-repeller-light-220v-electric-led-light-mosquito-killer-fly-bug-insect-zapper-trap-catcher-plug-lamp-i980340301-s2115582115.html?spm=a2o4m.searchlist.list.23.4b1a110bFGNBCn&search=1