Split systems come pre-gassed and essentially mount a unit indoors, place the outside unit, drill a hole for the hose and plug in plus a power supply
You also require a suitable vacuum pump to evacuate the system & remove moisture before releasing the gas.
37 C near York yesterday, but the wheezing, rattling floor standing air con unit in my "office" (half a Portacabin) at work kept the temeprature to a bearable 27C & the car aircon made the journey home comfortable.
I have a ceiling fan in the bedroom, so last night was also comfortable. It was 21 C at 6.30am this morning as I left for work.
Worst temps I have had to work in was in Dubai in July – 48 C with very high humidity. The factory was supposedly air conditioned, but the units were mounted along one wall & I was was working next to the opposite wall, sheilded by the lathe I was working on. I ended up fashioning a "Rambo" style bandana from rolled up paper towel to stop perspiration running into my eyes & religeously drank 2 cups of water from the chiller every hour. Still I was better off than the works maintenance fitter, who had to visit the Saudi subsidiary works – 55 C & no air con there. Then, after a 12 hour day, I returned to hotel room chilled to 16 C & had to request it be warmed up ! Ended up with chest problems after a fornight of that regime.
Nigel B.