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$99.99AITECAC CloudStorm S6 Inline Duct Fan 6 Inch, 402 CFM Ventilation Exhaust Fan with Variable Speed Controller, Silent Energy Saving Grow Tent Fan for Heating Cooling Booster, HydroponicAmazon- $3.98Home Energy : Your Best Options for Solar Heating and Cooling, Wood, Wind, and Photovoltaics by D. S., Hupping, Carol HalacyBetter World Books
- $109.99Heat Pumps for Sustainable Heating and Cooling (Green Energy and Technology)Amazon
- $9.99DIY: How to Make Cheap Air Conditioning Earth Tubes: Do It Yourself Homemade Air Conditioner - Non-Electric Sustainable Design - Geothermal Energy - Passive Heating and CoolingAmazon
- $4.99DIY: Simple Passive Solar House: Design for 90% Energy Efficiency to Save Money on Heating and CoolingAmazon
- $119.98TerraBloom ECMF-150-R, Quiet 6" Inline Duct Fan with Wireless Remote Speed Controller, Air Tight Metal Casing, Energy Efficient EC Motor. Heating and Cooling Booster and Exhaust Blower For GrowingAmazon
- SAVE $15.62$94.37$109.99Design for Micro-Combined Cooling, Heating and Power Systems: Stirling Engines and Renewable Power Systems (Green Energy and Technology)Amazon
- $799.99Gouku- Universal 12V Air Conditioning Conditioner Heating and Cooling Under Dash A/C Kit fit Van Auto RVs Truck Electric AC energy SavingAmazon
- SAVE $5.00$54.99$59.99Suncourt Flush Fit HC500-B Vent Cover with Fan Booster, Energy Efficient AC Register Booster, Improved Air Flow for Better Indoor Heating and Cooling, BrownAmazon
- SAVE $200.00$469.99$669.99LUORISE 9000 BTU WiFi Mini Split AC/Heating System, Ductless Air Conditioner, 19 SEER2 Energy Efficient Inverter AC, Cools Up to 400 Sq.Ft, Pre-Charged Heat Pump & 16.4ft Installation Kits, 115VAmazon