Hold 7.0 °C at 16 kW
FROST-16KW-7C
- Electric heater set to 16.0 kW
- Single glass, 4 Feb design night
- Example result: low 7.0 °C, 171.4 kWh
Pick your night
Cold-night floor
Cheapest survivable
Glazing swap
Choose a frost-night preset and run it first
Three starting setups taken from the kind of runs Icing Fisha stores. Copy a tag, note it, then open the app and dial in the values. Fast decision, fast answer.
Cut heat to 50.42 kWh
Tonight's 06:00 low arrives in--:--:--
FROST-6KW-1C
- Heater dialed down to 6 kW
- Example result: low 1.4 °C, 9.0 h wet
- Flagged in the app as a cold night, but no harm
Twin-wall vs bubble lining
GLAZE-TWIN-8C
- Same house, 10 Apr, two glazing types
- Example lows: 7.7 °C and 7.8 °C
- Compare both from the Saved runs list
Preset tags are personal reference labels, not rewards or guarantees. Example figures come from sample runs and will differ for your greenhouse, weather and energy prices.
Built for growers
Every dial that decides your night
Skip the guesswork. Icing Fisha puts the settings that move your greenhouse temperature in one place and shows the result hour by hour.
Heater threshold and power
Set where the heater switches on, from 8.0 °C in the sample, then pick 16.0 kW or any value with plus and minus. Choose Electric, Gas or Heat pump.
Vent automation
Vents open gradually over 4 °C above your limit. In damp air they crack open up to 30% once humidity passes your setting.
VPD comfort zone
Watch vapor pressure deficit in kPa against a shaded comfortable band, so you see when air turns too wet or too dry for the crop.
Hour-by-hour energy
A stacked chart splits each hour into Sun, Heater, Stored heat, Glazing loss, Vent loss and Transpiration, with gains above zero and losses below.
Saved runs and Compare
Keep scenarios like Frost night unheated, 6 kW heater or twin-wall glazing. Each card shows a temperature ring, lowest temperature, wet hours and kWh.
Season and yearly cost
Set yearly mean, summer-winter swing and daily range. Read heat per month and wet-pane hours, plus totals such as 9961 kWh and a fuel cost of 2988.24.
Sunset to sunrise
How one frost night plays out
Set the rules
- Pick the temperature below which the heater runs. It ramps in proportion over the last degree, instead of slamming on.
- Set the vent point. Above it, vents open smoothly across 4 °C.
- Set the humidity limit for the vents to crack open when air gets wetter than it.
Watch the 24 hours
- The outside curve in the sample drops from about -1 °C to about -10 °C near 06:00, then recovers.
- Humidity climbs from around 65% to around 80% by midday.
- VPD stays inside the comfortable band around 0.5 kPa when the setup works.
Race your own runs
- Save each variant under a plain name, such as 16 kW heater or 6 kW heater.
- Open Compare and see which run keeps the crop safe for the least energy.
- Read the short verdict on each card, like Frost reaches the crop or Too hot at midday.
Under the glass
The model behind your numbers
Icing Fisha builds a 24-hour design day from your settings. Temperature, relative humidity and vapor pressure deficit are drawn as three separate line graphs on a 00 to 24 hour axis, so cause and effect line up.
Energy is tracked as flows. Sun, Heater and Stored heat push energy in. Glazing loss, Vent loss and Transpiration pull it out. Because both sides are stacked around a zero line, you can see exactly which hour the heater is covering for the glass.
The Season screen stretches that day across a year. You enter a yearly mean (10.5 °C in the sample), a summer-winter swing and a daily range taken from your design day. The app then shows heat each month in kWh, wet-pane hours per day and annual totals for heat and fuel cost.
| Purpose | Greenhouse climate and heater cost modeling |
|---|---|
| Heater types | Electric, Gas, Heat pump |
| Sample heater power | 16.0 kW, adjustable |
| Heater on below | 8.0 °C (sample) |
| Vents open above | 24.0 °C, over 4 °C |
| Humidity vent | Above 85%, up to 30% open |
| Sample night result | Low 7.0 °C, 171.4 kWh |
| Sample year | 9961 kWh, fuel cost 2988.24 |
| Version, size, price | Shown on the store page |
Run tonight's frost before it runs you
Mobile app. Price, file size and install details are listed on the store page. Open it, enter your heater and glass, and get your 06:00 low in a few taps.
Download Icing FishaCheck device requirements, any ads or in-app purchases and the age rating on the store page before installing.