Why The Thermostat’s Wrong

Thermostats are a great technology in principal. They automate a simple issue: if cold, turn on the heater. Before thermostats, someone would have to either stoke a fire or open a valve for hot water to flow. By comparison, any automation should seam brilliant, but there is a slight flaw.   Single Point of Reference In most homes and even small businesses, there’s a single thermostat, and it measures the temperature in a single place. Even in a smaller home, this can lead to drastically different temperatures across the building. Typically a thermostat’s in the center of the building to get the best ‘average’ temperature. This average however, is almost never correct. In the case of my own home, we can actually measure the temperature difference between rooms. My room is the second on the heating loop, and consequently has some of the hottest water delivered to it, the most available energy. By the time this water has reached the kitchen and living room at the end of the loop, the water’s significantly cooled, resulting in a potentially 10 degree temperature difference. These differences can be exacerbated by design flaws. The bedrooms in this house, for example, have base boards that are about half the circumference of the rooms. This allows for a ton of heat to be left in these rooms. The living areas of this house however, have a much, much lower ratio. Those baseboards are only able […]

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Unfreezing a Freezer

How do you run your refrigeration hardware through the winter? How far does our industry go to keep a fridge running in the winter or a hospital chilled in a blizzard? There are a number of technologies at play, all working to manipulate the hardware to do their bidding. These are collectively called Defrost Controls.   Let Nature Take Its Course The simplest defrost system is little more than a few switches and a timer. In many systems, the greatest concern is that the evaporator coil may freeze over. This is especially common with industrial freezers. This is a year-round problem and it can be caused by staff frequently entering and leaving a freezer. The freezer temperature increases and many refrigeration systems end up running for entirely too long. The evaporator coil builds up ice from being chilled too much. In configurations like this, the simple solution is a time delay. The compressor shuts down, but the evaporator fan is run for an extended period, forcing relatively warm air over the coil. Whatever ice was there melts and the system can return to it’s regular cycling after the defrost cycle finishes. This can be set to run on timers or in more advanced systems, as necessary using temperature readings. In some installations, it can even be boiled down to a timer which triggers the cycle once every 24 hours and just turns off the refrigeration system for an hour to […]

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How to Pick a Thermostat

We talked about installing a Thermostat and a little bit of the install process. Today, we’re going to look a little deeper into the factors and reasoning behind picking the perfect thermostat for your needs.   The Key Factors What type of HVAC System do you have? Heating, cooling, multizone? What can your existing system support? What do you want out of your new thermostat? Efficiency, ease of use, programmability, automation? If you can answer these questions, you can begin to narrow down what type of thermostats will fit your needs. There is a wide range of options out there, from simple, old fashioned set it and forget it units straight up to smart thermostats that detect and learn the building’s occupancy over time. Let’s dig a little deeper.   The Existing Hardware Your first concern is going to be making the best out of the hardware you’re already using. If you own a multizone system, it would be a tremendous step backwards to install a single, old fashioned thermostat for the whole building. If you own a simple hot water furnace with some radiators in a single zone system, a multi-room thermostat is probably going to be overpriced for the limited returns it can deliver. If there’s a full heating and cooling system, that too needs to be factored in. There are thermostats out there which are heating only. There’s probably even thermostats out there which are cooling only […]

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How We Installed a Thermostat

Here at the Procure office, most of what we specialize in is pricing, product hunting, and the general theory of what makes your furnace tick. How’s a thermostat work? It measures temperatures and sends either digital signals or specific voltages over wires to make the system do your bidding. Yesterday, we got to actually trade some theory for practice. Specifically, I got to trade theory for practice. My home thermostat of 20+  years finally croaked.   My Symptoms It was pretty hard to miss that the thermostat had died. As it began getting chilly outside and as the house started to feel more like a meat locker, we followed common sense and set the thermostat. At least, we tried to. On day 1, we pushed the little slider to ‘heat’, and the screen stayed dark. On day 2, we changed the batteries. The screen remained dark. Pressing the buttons really did nothing, but after some bored tinkering and prodding, the circulator pump came to life. Heat restored. How much heat? We didn’t know. The home office was an inferno. Our cats refused to go anywhere near the baseboards they usually love to sprawl against. I put a fan in the window and even mother nature’s frosty 30ºF breeze couldn’t fight off the furnace’s heat. Our thermostat had developed a fever or it was nostalgic for the hot and lazy summer.   Other Symptoms of Failure When your thermostat fails, you […]

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