For a non-obvious leak it's pretty normal to recommend a new system at that age. The reason is that a tech's time is expensive, and finding a leak can take a lot of time. Then once it's found, if the leak is in the exchange you're looking at a fairly large replacement part cost.
At least in the US, refrigerant costs have been high because of a shortage, not taxes.
At least in the US, refrigerant costs have been high because of a shortage, not taxes.
https://www.coolingpost.com/world-news/us-ac-companies-move-...