Logo Design - HVAC (heating ventilation & air conditioning)

This is what SM TECH was looking for in their logo design

We are starting HVAC (heating ventilation & air conditioning) company (SM TECH), servicing residential and commercial clients. We need a design that reflects that we are a HVAC, home/business automation/maintenance company.
The design should be clear, simple and elegant and must leave customer thinking we are reliable and trustworthy, and our services will give comfort and make life better/rich.
For an idea of our business, look @ this website of one of our competitors: http://www.arpis.com/
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