Plant Care
- • Climate Control & VPD16
- • Disease & Pest Management14
- • Nutrient Solutions & EC34
- • Plant Health Monitoring7
Climate & Energy Optimizer — HVAC & Cost Blueprint
A climate and energy optimizer that sizes the HVAC your grow room actually needs and prices the electricity it will burn. It totals the heat your lights dump into the canopy (90% of every watt), what bleeds through the room envelope by insulation class, what ventilation carries in and out, and the latent load every transpiration pump carries — then converts that peak to BTU/hr and HVAC tons, divides the year-round cooling and heating work by the heat pump COP, lands on a kWh-per-day and a dollar cost per day and month, and scores the whole setup on a 0–100% efficiency gauge with a plain GREEN / YELLOW / RED verdict.
Room heat load
live
heat load
3.92
Lighting heat
1.8
Latent load
0.60
Conduction
1.05
Ventilation
0.47
Ring segments — the sources of room heat. The centre holds the sum the HVAC has to remove.
Inputs
12 parameters · live recalculation on every change
M²
1m²
20m² default
500m²
W
100W
2000W default
20000W
°C
15°C
24°C default
35°C
°C
-20°C
10°C default
45°C
Pro Settings — Lab Controls
1
3 default
5
0.1
0.3 default
0.8
KJ/K
100kJ/K
500kJ/K default
5000kJ/K
Advanced Settings — Deterministic Corrections
%
30%
60% default
90%
/H
0.1/h
2/h default
20/h
$/KWH
0.05$/kWh
0.15$/kWh default
1$/kWh
H/DAY
1h/day
18h/day default
24h/day
Insight band · live
Stacking the room heat load
Lighting, latent, conduction and ventilation heat build the total the HVAC has to reject — the running total lands on the heat load.
- Lighting heat 1.8 1.80 kW
- + Latent load 0.60 2.40 kW
- + Conduction 1.05 3.45 kW
- + Ventilation 0.47 3.92 kW
- Heat load 3.92 3.92 kW
HVAC size: 1.11 tons
Cooling load: 0.88 kW
Running total after each term — the final net matches the headline reading in the result card, kept in sync live.
Deterministic model
12 inputs · 10 outputs
Runs 100% in your browser
This is a deterministic model: the same inputs always produce the same outputs, calculated entirely in your browser with nothing sent to any server. It is a planning aid — not a quote, not a dosing instruction, and not a yield forecast. Treat every line as a working estimate and validate it against your own prices and measurements.
It models one system: A climate and energy optimizer that sizes the HVAC your grow room actually needs and prices the electricity it will burn. It totals the heat your lights dump into the canopy (90% of every watt), what bleeds through the room envelope by insulation class, what ventilation carries in and out, and the latent load every transpiration pump carries — then converts that peak to BTU/hr and HVAC tons, divides the year-round cooling and heating work by the heat pump COP, lands on a kWh-per-day and a dollar cost per day and month, and scores the whole setup on a 0–100% efficiency gauge with a plain GREEN / YELLOW / RED verdict.
What the Climate & Energy Optimizer — HVAC & Cost Blueprint returns
The engine computes 10 outputs from your 12 inputs. The headline number is Energy Use (kWh/day), alongside HVAC Capacity, HVAC Size, Cost / Day. Every output updates live as you change a parameter.
What it does not do
Outputs depend on the inputs and assumptions shown here. Confirm relevant measurements and local conditions before acting.
STEP 01
Set the room and the lights
STEP 02
Lock the envelope
STEP 03
Size the machine
STEP 04
Settle the yearly work
STEP 05
Bill it
STEP 06
Score the setup
Q_L = 0.9 \times \frac{P_{light}}{1000}\ \text{kW}
Lighting heat — 90% of every lamp watt is sensible heat
Q_C = \frac{U \times A \times 2.5 \times \Delta T}{1000}\ \text{kW}
Conduction through the envelope — U by insulation class
Q_V = \frac{ACH \times A \times 2.5 \times 1.2 \times 1.005 \times \Delta T}{3600}\ \text{kW}
Ventilation load — air changes against the temperature delta
Q_X = \frac{P_{light}}{1000} \times f_{latent}\ \text{kW}
Latent load — transpiration returns a share of lighting power as moisture
Q_{tot} = Q_L + Q_C + Q_V + Q_X;\quad BTU/hr = Q_{tot} \times 3412;\quad tons = \frac{BTU}{12{,}000}
Total heat load sized to BTU/hr and HVAC tons
E = \frac{P_{light}}{1000} \times h + \frac{Q_{hvac}}{COP} \times h\ \text{kWh/day}
Energy per day — lighting plus HVAC work divided by COP
C_{day} = E \times r;\quad C_{month} = C_{day} \times 30
Cost per day and month at the electricity rate
\eta = 100 - \frac{E_{hvac}}{E_{total}} \times 100 - P_{ins},\quad\text{clamped }0\text{–}100
Efficiency — lighting work share minus the insulation-class toll
Insulation U-values — poor 2.5, average 1.5, good 0.8, excellent 0.4 W/m²K over the 2.5 m effective wall-and-ceiling multiplier.
Lighting heat — about 90% of every lamp watt lands in the canopy as sensible heat and must be moved.
Ventilation — ACH × room volume × 1.2 kg/m³ × 1.005 kJ/kg·K × ΔT ÷ 3600 kW, the air-change load shared with the archived co2 and cfm engines.
Latent — transpiration returns roughly 30% of lighting power (f_latent 0.3) as moisture work the dehumidifier must pull.
BTU and tons — 3412 BTU per kW-hour, 12,000 BTU per HVAC ton; energy = lighting kWh + (dominant HVAC load ÷ COP) × hours; cost = kWh × rate, monthly × 30.
Efficiency — lighting share of total energy minus insulation toll (poor 20%, average 10%, good 0%, excellent +5%); GREEN over 70% with cost under $2/m²/day and delta under 15 °C, RED under 50%, over $4/m²/day, over 25 °C delta, or past 100,000 BTU/hr.
- Lighting heat — Q_L = 0.9 × P_light ÷ 1000 (kW). The archived cfm-air-exchange engine priced this exact 85–90% light-to-heat factor before this board sized the ventilation it demands.
- Conduction — Q_C = U × A × 2.5 × ΔT ÷ 1000 (kW), U from insulation class (poor 2.5, average 1.5, good 0.8, excellent 0.4 W/m²K) over the 2.5 m effective wall-and-ceiling surface.
- Ventilation — Q_V = ACH × A × 2.5 × 1.2 × 1.005 × ΔT ÷ 3600 (kW), the air-change model the archived co2 and cfm engines shared.
- Latent — Q_X = P_light ÷ 1000 × f_latent (kW), transpiration returning about 30% of lighting power as moisture the HVAC must pull.
- Peak sizing — BTU/hr = Q_total × 3412 and tons = BTU ÷ 12,000: the same two conversions the archived chiller-sizing engine used after it summed pulldown, ambient and pump heat.
- Energy and cost — E = lighting kWh + (dominant HVAC load ÷ COP) × hours, C = E × rate, monthly × 30 — the kWh-times-rate billing of the archived energy-cost-simulator, with cooling work divided by COP exactly as it did.
This model combines the earlier Climate-controller-calculator, Energy-cost-calculator, Hvac-sizer models.
Q1: Climate controller calculator hydroponics — what should it actually calculate? ▾
A climate controller calculator for hydroponics totals every heat source the HVAC must fight — 90% of lighting watts land in the canopy as sensible heat, conduction bleeds through the room envelope by insulation class, air changes drag the volume through the temperature delta, and transpiration returns a share of lamp power as latent load. The climate-and-energy optimizer here sums those and prices the result to BTU/hr, HVAC tons, kWh per day and dollars per day and month.
Q2: Grow room energy cost calculator: how do you estimate the bill? ▾
The grow room energy cost calculator starts from kWh: lighting is installed watts ÷ 1000 × photoperiod, HVAC electricity is the dominant cooling or heating load divided by the heat pump COP times the same hours, and the total kWh times your blended rate is the daily cost — month it by 30. On a 20 m² room with a 2 kW lamp running 18 hours at $0.15/kWh, that is roughly 41 kWh and about $6.20 a day.
Q3: HVAC sizer grow room: what capacity do you need? ▾
An HVAC sizer for a grow room works from the total heat load, not the square footage: sum lighting heat, conduction, ventilation and latent load in kW, multiply by 3412 for BTU/hr and divide by 12,000 for HVAC tons. A 20 m² room with a 2 kW lamp in a mild climate lands near 13,000 BTU/hr and just over a ton; a commercial 100 m² room with 10 kW of lamps on a hot day lands over 50,000 BTU/hr and around 4.2 tons.
Q4: How much energy does grow room use per day? ▾
A grow room uses lighting watts for the photoperiod plus HVAC electricity for the dominant cooling or heating load divided by its COP. The lighting half is easy — a 2 kW lamp across 18 hours is 36 kWh — and the HVAC half adds what it takes to hold target against the outside envelope, so a typical home tent announces around 40–50 kWh/day and a commercial 100 m² room around 250–270 kWh/day.
Q5: BTU calculator grow room: how is HVAC capacity computed? ▾
The BTU calculator for a grow room multiplies the total heat load in kW by 3412. Total load adds 90% of lighting wattage, conduction at U × area × 2.5 × ΔT, ventilation at ACH × volume × 1.2 × 1.005 × ΔT ÷ 3600, and the latent share of lighting — so a 3.9 kW total is about 13,300 BTU/hr and a 14.9 kW total is roughly 51,000 BTU/hr.
Q6: How to reduce energy cost hydroponics: the three levers ▾
To reduce energy costs in hydroponics, attack the three biggest rows of the bill in order: insulation (moving from poor to excellent cuts the envelope toll from a 20% efficiency penalty to a bonus), lighting draw (the largest single kWh line at full photoperiod), and HVAC COP (each point of COP splits the cooling and heating electricity). An efficiency over 70% with cost under $2/m²/day and a temperature delta under 15 °C is the green target.