NO - as air conditioning systems use fluorinated gases as refrigerants, all work on them must be done by professionals holding valid F-Gas certification. There is a range of different qualifications and certifications that apply for this, so it's always best to ask someone who is qualified to do this.
Helmsdale
Helmsdale is a village on the east coast of Sutherland, in the Highland council area of Scotland. The village is on the A9 road, at a crossroads with the A897, and has a train station on the Far North Line. Buses operate roughly every two hours Mondays-Saturdays and rarely on Sundays from Helmsdale to Brora, Golspie, Dornoch, Tain and Inverness in the south and Berriedale, Dunbeath, Halkirk, Thurso and Scrabster in the north. West Helmsdale lies on the river from the main village above the train station. Old Helmsdale is directly to the north while East Helmsdale is a settlement barely a mile to the east. Helmsdale is a fishing port at the estuary of the River Helmsdale, and was formerly the home of one of the largest herring fleets in Europe. The river itself is well-known for its fishing. Helmsdale Castle, the remains of which were destroyed in the 1970s in order to construct the brand-new A9 road bridge, was the setting of the murder of the 11th Earl of Sutherland in 1567. The Earl and his Countess Marie Seton were poisoned by Isobel Sinclair. The modern-day village was planned in 1814 to resettle locals that had been eliminated from the surrounding straths as part of the Highland Clearances. Facilities in Helmsdale include an independent youth hostel, a culture centre, an art gallery, and an inn. Helmsdale is widely known for its Highland Games which are celebrated on the 3rd Saturday in August annually. Best known is the evening Marquee Dance when the village population of 700 more than doubles because of visitors being at the dance. Helmsdale is also the home of Bunillidh Thistle F.C. and Helmsdale United. For all of your home renovations, make sure to identify trustworthy contractors in Helmsdale to make certain of quality.