Select Home Depot Stores (link for reference only) have QuietCool 1945 CFM Smart App Controlled 2-Speed Gable Mount Electric Attic Fan (AFG SMT PRO-2.0) for $16 (In-Store Only).

Note: In-store availability and price will vary.

Features:

• Energy-efficient 2-speed PSC motor
• Smart app control with integrated thermostat and humidistat
• Built-in mounting tabs with anti-vibration pads
• Mounts directly to your existing gable vents in your attic
• 70-Watt on low speed and 108-Watt on high speed
• Up to 1,945 CFM on high at 120-Watts
• Fire safety sense shut-off
• 15-Year Warranty