Do your homework. Familiarize yourself with the insurance and license conditions in the Central Florida area. Smart customers do their research when it comes to HVAC systems and this helps them to know just what to ask, especially when it comes to certifications and legal requirements.
Ask around for referrals. It is not wrong to ask names of contractors that your relatives and some trusted friends have used for their home services. You can also ask them how their experiences were and use this to narrow down your choices. You can also check and compare company reviews by searching their websites online.