refrigerant - the refrigerant number installers in Letterkenny argue about.
Two bids can look similar while assuming different refrigerant values; the cheaper one often specs down. Ask for the figure in writing and check it against the manufacturer datasheet before you sign.
Oldtown, Letterkenny Cathedral Town and Ballyraine: Year-round emergency plumbing demand in Letterkenny. Population around a steady base keeps emergency plumbing demand steady. Quotes via the boilerrepairletterkenny network.