Put in a Trane 4-ton Variable speed system 4 years ago. We also did a 4-zone system. Zoning added almost $4K to the price. I believe we have saved close to $4K to date as this system is extremely efficient. I say that because our SECO bills in the heat of the summer are just a touch over $100. Last month $107 and projected for this month $113. 2100 sq ft home. Average temp setting in home, 77 per Trane app.
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