Negotiating Air Con


I am getting a quote for Reversible air-con this week. I've read the thread on haggling but specifically for air-con, is it expected that I haggle? I guess the most important thing for me is that I dont get ripped off rather than trying to getter a better deal, just want re-assurance that a quote for air-con will generally be fair-ish from a reputable company.

Many thanks for any re-assurance.