Highlights from their answers:

• "Drives are a must have in all HVAC projects. The real issue is that customers become familiar with one brand or product."
• "HVAC systems all have them. The issue is who, not what."
• "The market seems to believe in them now. When we're convinced of short payback we don't resist."
• "We know we need them. We listen to the market for brand preference."

Data to follow in subsequent posts.