{"product_id":"keeping-it-warm-von-madeline-hansen","title":"Keeping it Warm","description":"\u003cp\u003eHeating systems are the largest factor in determining the environmental as well as economic impact of running a winter greenhouse.  As heating winter greenhouses proves very costly, environmental sustainability is often marginalized in the pursuit of minimizing heating system expenditures. This paper examines a range of heating systems (natural gas, propane, waste-heat water, biodigester, biomasss, geothermal, and solar power) to determine which is the most economical and environmentally responsible. A literature review was conducted examining the proposed heating systems, comparing the average Btu consumption values both for large and small greenhouses maintained at 50°F, during a typical winter season from October to March. The results of this review indicate that ground source heat pumps provide the most effective solution to heating a winter greenhouse in Minnesota, taking into account both the environmental and economic costs.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783659458385\"\u003e\u003ch3\u003eExploring the Heating Options for Winter Productive Greenhouses\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Softcover - 9783659458385","offer_id":39484191244381,"sku":"9783659458385","price":35.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/91e5c579-d6a7-417a-8217-33ef248f002f.jpg?v=1776404539","url":"https:\/\/shop.autorenwelt.de\/products\/keeping-it-warm-von-madeline-hansen","provider":"Autorenwelt Shop","version":"1.0","type":"link"}