A greenhouse that survives winter is not automatically a greenhouse that stays warm enough to grow through winter.
Start with the constraint
Structural snow capacity protects the building, while glazing insulation and air leakage determine how much heat is required inside.
What changes the decision
Heating cost can dominate ownership in cold climates. A large poorly insulated greenhouse may be cheaper to buy but much more expensive to operate.
What to verify before buying
Separate the structural winter requirement from the growing-temperature requirement. Size the heater from local design temperatures and the actual glazing system rather than a generic greenhouse estimate.
How we research greenhouse kits
We compare frame geometry and materials, covering, included components, ventilation, climate fit, working dimensions, anchoring, shipping method, assembly burden, upgrade paths, and completed build cost.
Prices, specifications, firmware, and configuration-driven features can change. Check the current manufacturer page and local requirements before buying or installing equipment.