Half the houses you quote have no central cooling, so the form must ask
The most useful question a Front Range HVAC form can ask is what the house has now, because the answer decides which truck goes and which conversation happens.
Give the visitor a short list rather than an open text box. Furnace with central air. Furnace with an evaporative cooler. Boiler and radiators. Window units or nothing. One tap sorts a repair from a conversion sale before anyone picks up the phone.
Keep the whole form to about six fields. Address or ZIP, what heats the house, what cools it, what is wrong, name, phone. Every extra field is a chance for the visitor to decide they will call somebody else instead.
Allow an optional photo. A picture of the equipment closet or the roof unit answers questions that would otherwise take two calls, and homeowners send them willingly when the button is obvious.
Do not ask for budget on a first inquiry. It reads as a filter, it lands badly on a repair call, and on a replacement it invites a number the homeowner made up on the spot.