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Miner-Heated Greenhouse Sizing Calculator: How Many ASICs Does Your Greenhouse Need?

A greenhouse is the food layer of a resilient homestead — and heat is what keeps it alive through a Canadian winter. A Bitcoin ASIC is, thermodynamically, a ~100%-efficient electric resistance heater that pays part of its own power bill in sats, which makes it a natural match for the one building on your property that wants low-grade heat all season long. The hard question has never been whether miner heat works in a greenhouse (it does — it’s dry, CO₂-free electric heat), but how much: how many watts does your envelope lose on a design-cold night in your city, and which miners cover it?

This calculator joins two open datasets D-Central already publishes — the Canadian heating-degree-days dataset (ECCC climate normals) and the ASIC heat-profiles dataset (thermal output per model) — into that sizing answer. Enter your greenhouse footprint, wall height and glazing type (typical published U-values), pick the target band your crops need (frost-free 5 °C, cool crops 10 °C, warm crops 18 °C) and the coldest night you’re designing for, and it computes the conduction heat loss and recommends miner models and counts that hold it.

Quick answer

A Bitcoin ASIC converts essentially 100% of its wall power into heat, and a greenhouse loses heat through its glazing at roughly A x U x deltaT watts (envelope area x glazing U-value x the indoor-outdoor temperature difference). Worked example: a 6 x 3 m single-poly hoop house with 2 m walls has about 56 m2 of envelope; holding a frost-free +5 C on a -25 C design night (deltaT 30) needs about 56 x 5.7 x 30 = 9.6 kW of continuous heat — roughly three S19-class miners (3,250 W thermal each). A small 20 m2 envelope at the same conditions needs about 3.4 kW — one S19-class unit.

Size against the coldest night you want the greenhouse to survive, not the seasonal average — and treat the result as a PLANNING reference, not an engineering sign-off. Conduction-only math excludes infiltration, wind and thermal mass, so leave capacity margin.

The outdoor design temperature is the coldest night you want the greenhouse to survive — it is YOUR pick, not a value from the climate dataset. Check your local building-code January design temperature or your own weather records; −25 °C is a conservative generic starting point, mild coastal sites can use −10 °C, and the far north should go lower. Picking a city above only adds climate context (annual heating degree-days and the average-season temperature gap derived from them) — it does not set the design temperature for you.

Method (conduction-only planning math): envelope area A = 2 × (L + W) × wall height (walls) + 1.1 × L × W (a low-pitch roof approximated as footprint × 1.1). Design heat loss = A × U × ΔT watts, where ΔT = target inside temp − outdoor design temp; BTU/h = watts × 3.412. Glazing U-values are typical published engineering values for the glazing class, not a product rating. This EXCLUDES infiltration and wind losses, perimeter/ground losses, solar gain and thermal mass — a real greenhouse on a windy night loses more than this, so leave margin. The per-city average-season ΔT is derived arithmetically from the ECCC HDD18 dataset (HDD18 ÷ heating days) and assumes an 18 °C base — for 5 °C or 10 °C targets it is an upper bound. Miner thermal output comes from the ASIC heat-profiles dataset (an ASIC converts ~100% of wall watts to heat). This is a PLANNING reference, NOT an engineering sign-off — final sizing, electrical work (most of these miners need 240 V circuits) and installation belong with a licensed professional. Stock ASICs run ~75 dBA: fine for a detached greenhouse, but plan acoustics for neighbours, duct or filter the airstream to keep dust off foliage, manage humidity, and add over-temp venting for sunny days. This sizer is one layer of D-Central's Homestead Resilience stack.

Reading the result honestly

The math here is deliberately simple and stated in full in the method box: envelope area × glazing U-value × temperature difference, conduction only. Real greenhouses also lose heat to infiltration and wind, and gain it from sun and thermal mass — so treat the design-night number as a floor, leave capacity margin, and remember that everything on this page is a planning reference, not an engineering sign-off. Electrical work (most of these miners want a 240 V circuit), permits and final sizing belong with a licensed professional. One practical tip: firmware power tuning lets a miner track your heat load instead of running flat-out — D-Central’s own DCENT_OS (GPL-3.0, source-available, beta on the Antminer S9) exists for exactly this kind of control.

Go deeper

Ready to put watts in the ground? Browse D-Central’s refurbished Bitcoin mining heaters — S9-to-S21-class units prepped in Laval for exactly this kind of duty.

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Last reviewed July 2, 2026.