looking for a reliable technician for heat pump repair denver. the one I'm using is acting up.

My heat pump has started making a loud rattling noise when it switches on, and it doesn't seem to be heating as well as it should. I'm in the Denver area and with these temperature swings, I really don't want to be stuck without heat. I'm pretty handy, but this is beyond my skill level.

I've started looking for heat pump repair denver, but there are so many companies. It's hard to know who specializes in heat pumps versus just general HVAC, and I'd prefer someone with specific expertise since it's a bit different than a furnace.

Has anyone in Denver had a great experience with a company for heat pump repair recently? I'm looking for someone who is honest, does good diagnostic work, and doesn't just jump to "you need a whole new system" right away.

What should I expect to pay for a diagnostic/service call for a heat pump in Denver? Also, are there any questions I should ask to make sure they're qualified to work on my specific system? Any advice for dealing with this in our climate is appreciated.