Outdoor & Garden · Greenhouses
How much does a greenhouse actually warm things up?
Reviewer consensus
Less than buyers expect. A community thread cited in our signals notes that unheated pop-up greenhouses run only a few degrees warmer than outside ambient at night, their main value is wind, frost, and pest protection, plus solar gain during the day. For true cold-climate growing, owners pair the structure with a thermostatic heater or thermal mass.

