Disclaimer

Everything here is researched, not professional advice. Three areas need someone qualified rather than a website: plant health, structural loading, and anything electrical.

Growing guidance is researched, not professional advice

Temperature ranges, light targets, germination temperatures, spacing and season timings on this site come from USDA and cooperative extension publications, published horticultural data and verified grower reports. That is a solid basis for planning and it is not professional horticultural or agronomic advice, and it is not specific to your site, your soil, your water or your microclimate.

For a sick plant, a pest you cannot identify, or a decision with money riding on it, your local cooperative extension service is the right call and is usually free. They can look at the actual plant, which no website can.

The calculators are planning aids

The heater, ventilation, shade, light, soil volume and water tools apply standard published formulas and show their working. They cannot see your air leakage, the true condition of your glazing, how exposed your site is to wind, or how much thermal mass you already have, and every one of those moves the real answer.

Size with headroom rather than to the exact figure, and treat a result as an input to a decision rather than a specification.

Structural loads need the manufacturer's rating

Snow and wind load figures here are researched typical values for comparison. They are not a substitute for the published rating of the specific kit you are buying, and they are not an engineering assessment of your site. A greenhouse that fails under snow load is a real hazard, not just a lost crop, and clearing snow off a structure is safer than discovering its limit.

Anchoring matters as much as the frame. A greenhouse is a large, light, hollow object and wind moves them. Follow the manufacturer's anchoring instructions rather than a generic method from any website, including this one.

Electrical work needs a licensed electrician

Greenhouses are humid, often have standing water, and frequently need power run out to them from the house. That combination is exactly where amateur wiring becomes dangerous. Any circuit, outlet or fixture serving a greenhouse should be specified and installed by a licensed electrician, with the GFCI protection and the outdoor and damp-location ratings your local code requires. Nothing here is electrical advice, and permit requirements vary by jurisdiction.

Heaters, fuel and ventilation

Any combustion heater consumes oxygen and produces exhaust, and a greenhouse is a small sealed space. Follow the manufacturer's ventilation and clearance requirements exactly, and treat carbon monoxide as the risk it is. Electric heat avoids that problem entirely and is worth the running cost difference in a small structure.

Prices, availability and your own judgement

Prices are snapshots and build totals are planning figures. Confirm current prices with the retailer. Product recommendations are opinions offered in good faith rather than guarantees of fitness, and warranty, returns and defects are matters between you and the retailer or manufacturer.

To the fullest extent the law allows, GreenhouseSetup.com is not liable for loss or damage arising from use of this site, from decisions made using its calculators, or from equipment bought through its links. Nothing here limits liability that cannot lawfully be limited.