different between hvac vs vrf

hvac

hvac From the web:

• what hvac means
• what hvac stand for
• what hvac technicians do
• what hvac companies offer financing
• what hvac certifications do i need
• what hvac system do i have
• what hvac zone do i live in
• what hvac do i need

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vrf

vrf From the web:

• what vrf system
• what vrf stands for
• what vrf in cisco
• vrf what does it mean
• what is vrf in networking
• what is vrf lite
• what is vrf air conditioning
• what is vrf and vrv