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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Does anyone know of an off-the-shelf control system that would turn a ventilation fan on in a greenhouse and dump warm air into a high-mass heat storage room in winter / outside in summer? I want the fan to come on whenever the temperature in the soap-bubble greenhouse is warmer than the heat storage room, aka "the potting shed" (although since it's a Steve Kohrner flying concrete design it's more like a potting cathedral), so it’s not a fixed temperature sort of setup, it depends on the temperature difference between the two spaces.<o:p></o:p></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:13.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>Ross Elliott </span></i><i><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>LEED-AP, CPHC <o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:8.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>President<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><img width=182 height=55 id="_x0000_i1027" src="cid:image001.jpg@01CEB9FA.84B68600" alt="homesol_logo_sig"></span><span style='font-size:8.0pt;font-family:TimesNewRomanPSMT;color:#1F497D;mso-fareast-language:EN-CA'> </span><span style='font-size:8.0pt;font-family:TimesNewRomanPSMT;color:#1F497D;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>83 Little Bridge Street, Suite 109</span><span style='font-size:9.0pt;font-family:TimesNewRomanPSMT;color:#1F497D;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>Box 1133, Almonte, ON K0A 1A0</span><span style='font-size:9.0pt;font-family:TimesNewRomanPSMT;color:#1F497D;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>(613) 278-0467 / (613) 256-0427</span><span style='font-size:9.0pt;font-family:TimesNewRomanPSMT;color:#1F497D;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'>Fax (613) 256-2223</span><span style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-CA style='mso-fareast-language:EN-CA'><a href="http://www.homesol.ca/"><span lang=EN-US style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:blue'>www.homesol.ca</span></a></span><span lang=EN-CA style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'> </span><span style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E'><img border=0 width=84 height=84 id="Picture_x0020_1" src="cid:image002.jpg@01CEB9FA.84B68600" alt="Description: Capture"></span><span lang=EN-CA style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'> </span><span style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E'><img border=0 width=74 height=84 id="Picture_x0020_3" src="cid:image003.jpg@01CEB9FA.84B68600" alt="LEEDAP_BDCcmyk"></span><span lang=EN-CA style='font-size:7.0pt;font-family:"Helvetica","sans-serif";color:#1B366E;mso-fareast-language:EN-CA'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p></div></body></html>