Your freezer fails weeks before it fails.

Yes. Temperature is a critical control point under HACCP, and monitoring it is one of the seven HACCP principles: you must measure it, record the measurement, and record the corrective action when a reading goes out of range.

HACCP does not require the monitoring to be automated. It requires it to be documented and verifiable. That is the practical difference between a paper log and a continuous system. A paper log records what someone wrote down; a continuous system records what actually happened, including overnight and at weekends when nobody is there to write anything down.

A sensor inside the freezer sends readings to a gateway on site, and you see them on a phone or a web dashboard, with alerts when a reading crosses a threshold you set.

What decides whether this works is the radio, not the app. Wi-Fi and Zigbee do not pass through an insulated freezer panel, which is why many systems run a wired probe through the wall instead. That does work, but the probe is awkward to install, it costs more, and it means cutting into the insulation.

TemperatureWise uses LoRaWAN, a long-range low-power band that passes through several walls of steel and insulation without any penetration at all. The sensor goes inside the box, the gateway sits anywhere on site, and nothing is drilled through the panel. You get live and historic internal temperature, humidity and current draw, with text and email alerts when something goes out of range.

A freezer alarm tells you the temperature is wrong now. A monitoring system records temperature continuously, keeps the history for audits, alerts more than one person, and watches the pattern rather than only the threshold.

TemperatureWise detects developing equipment problems four to five days before failure and identifies the root cause. An alarm cannot do that, because by the time an alarm sounds the product is already warm and the only question left is how much of it you throw away.

In the warmest part of the box under normal operation, which is usually near the door and away from the evaporator's direct discharge. Mounting it in the evaporator airflow gives you a reading that looks better than the food's actual temperature, which is the most common placement mistake we see.

For product temperature rather than air temperature, the probe sits in a buffer, typically a sealed bottle of glycol, so the reading follows what the food is doing instead of spiking every time somebody opens the door. Renergy supplies the buffer where it is needed and matches it to what you actually store, because the right buffer for cases of frozen protein is not the right one for a cooler holding fresh produce.

Most health authorities and HACCP plans expect a recorded check at least twice a day, and many operators do one at every shift change. Confirm the frequency your own health authority requires, because it varies by jurisdiction.

Continuous monitoring does not remove the requirement to hold records. It replaces the manual reading with a recorded one, so the log is complete including the sixteen hours a day nobody is on site, which is also when most failures start.

$250 per sensor per year, which works out at roughly $21 per sensor per month, plus one-time hardware that scales with the size of the site.

A small restaurant with three reach-ins and its own Wi-Fi pays $175 up front and $750 a year. A mid-sized restaurant with two walk-ins pays $1,050 up front and $1,000 a year. A large site with three walk-ins, cellular and battery backup pays $2,500 up front and $2,300 a year.

Connectivity is free if you supply the internet. The full breakdown is in the pricing section above, with a calculator for your own sites.

Yes, when a cold box holds more stock than a year of monitoring costs. TemperatureWise is $250 per sensor per year. Before it had monitoring, one frozen smoothie brand lost $125,000 of stock in a single Sacramento freezer over a long weekend: enough to pay for 500 sensor-years.

The test for your own site is the stock in your fullest box against the yearly fee. The calculator in the pricing section above does it for you.

Yes. Our customers' saves add up to $850,000 in the first year: $150,000 of frozen stock kept with an alert 53 hours before a Philadelphia freezer peaked, $450,000 protected after 27 days of warning on a walk-in whose two refrigeration systems were both failing, and up to $125,000 protected twice in one parked reefer in Mississauga, when it failed to restart on 26 December 2025 and again on 13 January 2026, before the right technician could be found to fix it.

The first three each have a case study with the real sensor readings, so you can check the numbers yourself. Read the case studies.

$11,000 to $22,000 out of your own pocket on a fully insured $250,000 loss, from the math above: the deductible, plus the cost of waiting 3 to 6 months for the insurer's cheque.

That is before disposal, the margin on product you cannot sell, and any rise in your premium at renewal.

Monitoring is billed annually at $250 per sensor per year, which works out at roughly $21 per sensor per month.

Connectivity is the only other recurring cost, and it is zero if you supply the internet at the site. There is no separate charge for the dashboard, the alerts, the reporting or the setup.

Two for a mid-sized walk-in and three for a larger one, as a starting point.

The real number depends on the size and layout of the box, because a long walk-in with product stacked against the far wall does not behave like a square one. We size it with you rather than selling a fixed bundle, and more sensors costs more.

Yes. A TemperatureWise door contact on each walk-in, cold room or dock door records every opening and closing, overlaid on that room's temperature chart in the app. It alerts when an opening comes with a real temperature rise, so an inventory day or a long delivery does not set it off on its own.

It is $40 per door once, including consumables and installation, through one Bluetooth hub on site. Monitoring is $125 per door per year alongside temperature monitoring, or $250 a year on its own. Plan on a battery change about every 2 years.

Yes. Pricing is quoted per location because each site needs its own gateway, and which one depends on the size of the site: $100 for a smaller site, $250 for a mid-sized one, $450 for the strongest unit on a larger site.

Sensors talk to the gateway over LoRaWAN, which passes through steel and insulation, so one gateway covers a site without needing a device in every room.

Cellular costs $125 once for the hardware package plus $50 per year per location. If you supply the internet over Wi-Fi or Ethernet, connectivity is free.

Cellular is also what makes the battery backup option work, since a power cut usually takes the site router down with it.

If you want monitoring to survive a power cut, we supply a backup mini-inverter for $125 as a one-time cost. It needs the cellular connectivity package, because a power cut usually takes your router down with it, and a monitor running on site Wi-Fi goes silent at exactly the moment you most need it to speak up.

With the backup installed, the cellular connection stays up through the outage, so the sensor keeps logging and reporting without any gap and nothing needs re-pairing by hand once power returns.

As many email recipients as you want. For the urgent path, each sensor can be configured with up to three SMS and phone-call recipients.

Routing is set per sensor, so the walk-in freezer can wake the kitchen manager and the general manager while the dry store only notifies the site lead. That matters more than it sounds: a three in the morning alert sent to one sleeping phone is the same as no alert, and single-recipient alerting is a common and much-resented limitation elsewhere in this category.

Yes. Renergy supports HVAC, refrigeration and electrical motors from most manufacturers and at most sizes, including centralised systems, secondary loop systems and standalone units.

Monitoring is added to your existing equipment rather than replacing it, so this is not a capital project. In most cases nothing about how the refrigeration runs changes at all, you simply start being able to see it.