If your system is maintained regularly you should have years of trouble free use. But of course, things do go wrong.
You won’t be told you need a new unit if the old one can be repaired, and you’ll know the full price as soon as possible, and no nasty surprises later on.
I’ll pop by and tell you what the problem is. and how much it will cost to repair.
I’ll order the parts the same day (well, Debbie will) so your not left suffering in the heat for a moment longer than necessary.