4) Please confirm this advice if you would; it is better to have your thermostat left at 70°F. to 72°F. during the day while your home is empty and adjust accordingly when you get home as opposed to shutting off the heater/ac and turning on when you get home. I would think this would put less strain on the unit. Thanks in advance for your help. The answer…….
It would be better for you turn the system off while you are work and then turn it back on again after you arrive at home. There is a better way though. You can purchase a programmable thermostat and set the thermostat to your schedule. You set the programmable to turn off approximately a half hour before you leave in the morning and then set it to turn on approximately a half hour before you come home. This means you will not have to wait for the house to warm up or cool down after arriving at home. The programmable thermostat will make sure that the system is on so that when you arrive home there is a degree of comfort for you.
The programmable thermostat should be set for a temperature differential of 3 ° F. to 5° F. above the comfort zone temperature if your system takes a while to cool or heat the house. If your system has no problem cooling or heating the house you can increase this temperature differential to 7° F. to 12° F. That is, when you leave home the programmable thermostat timer increase the temperature in the summer and decreases the temperature in the winter so when you are not home the HVAC system doesn’t cycle as much and you save in energy costs. The same can be said about when you sleep at night. Be comfortable for sure but you can increase or decrease the temperature when you are sleeping and with a programmable thermostat set it to bring the house to a comfortable temperature just before you wake up. This is better than turning the system off completely and it maintains reasonable temperatures in your home or business whether you are there or not. The thermostat pictured to the left is the Honeywell Touchscreen programmable thermostat.
One thing to note about this though is that if your system is undersized or your house is not properly insulated then the system will continuously run no matter where you set the thermostat. A properly insulated house with the correct sized air conditioning and heating system will gain you more efficiency and less power bill by turning the system off when you are not home for prolonged periods of time. Think about the system running when you are not at home and the good that it is doing. It is not benefiting anyone except maybe a pet. The programmable thermostat properly programmed will reduce the costs of your energy bill by at least ten percent (according to the U.S. Department of Energy). This makes perfect sense to me and have my thermostat in my home (a Honeywell Touchscreen Programmable Thermostat) set to do the same thing. Unless I come home early my home is comfortable when I arrive home because I set the programmable thermostat to come on thirty minutes before I arrive home.
I’ve seen a lot of air conditioning and heating systems and I would not recommend this to you if your air conditioner typically runs all the time. You have a problem that is well beyond the thermostat and needs to be corrected. I would start with the insulation in the home and then move up to having the system checked and resized to make sure it has been properly sized in the past. Only then would I say get a programmable thermostat especially if your air conditioner or heating system runs all the time due to inadequate sizing or poor insulation. If all is fine with that then get yourself a programmable thermostat and save yourself some money on your power bill. Turning off during the day is not going to strain the heating and cooling equipment to the point where you have to worry about replacing the system sooner rather than later but it will save you money in energy consumption.
High Performance HVAC wants to help you understand your next boiler purchase better. To do this we want to break down all the different types of boilers, boiler components, and various options and features that you may find when seeking a boiler for purchase. Typically you want to find a like replacement for the boiler you currently have installed or if you are buying a new boiler you want a boiler that will handle the load and is durable. The most important feature about a boiler purchase is usually the fuel efficiency of the boiler.
Programmable thermostats can save you more than ten percent on your homes utility bills. For that reason a programmable can pay for itself within a few years depending on the type and expense of the type you purchase. I always lean towards Honeywell thermostats simply because I’ve seen their reliability in the field and sometimes ease of use. Among others, you can expect good quality from Honeywell thermostat products. The new, hi-tech style currently out on the market is the Honeywell touch-screen thermostat.
We are looking at replacing our boiler with a new boiler. The HVAC contractor, I suppose he is the salesman for the HVAC contractor, is trying sell us what he refers to as a rest control for our boiler. He tells us it will save us more money by making our boiler more efficient. I think I understand how it works but my wife is not entirely sure about it. Can you tell us what you think about a boiler reset control and how it works?
Thanks and we have learned so much from High Performance HVAC. Keep up the good work.
This damper is part of a free cooling system for a rooftop economizer. It is part of an economizer damper system which allows free outside air cooling when the outside air temperature and humidity are ideal. This economizer also works on CO2 control so that if the CO2 levels inside the space rise above a CO2 set point the economizer damper opens allowing fresh outside air into the space while venting the air laden with CO2 to the outside. Continue reading “HVAC Rooftop Economizer – CO2 Control” »
In air conditioning and heating applications it is necessary to accurately measure temperature to offer control of the temperatures relative to the application for which the HVACR equipment is serving. There are four separate temperature scales used to measure temperature and it becomes necessary at times to have the ability to convert between the different scales. The two most common scales used by most people are Fahrenheit and Celsius. Fahrenheit is mostly used in the United States where the culture has resisted changing from standard measurements to the metric system. Celsius is used throughout the world including the United States and Canada. Scientist often use Kelvin and Rankine measuring scales to measure temperature. These temperature scales, Rankine and Kelvin, are uncommonly used in popular culture no matter where you live in the world except by the scientific community and are often used to measure extreme temperatures. Continue reading “Temperature Measurement & Conversion for HVACR” »
HVAC Piping systems especially in the Northern regions need a way to freeze protect piping the runs outdoor which is a necessity in many different HVAC application. To protect HVAC piping from freezingheat trace tape is wound around the pipe and controlled by an outdoor thermostator temperature control that energizes the heat trace tape and keeps the pipe from freezing. Heat trace tape looks similar to Romex and simply provides electrical resistive heating for the pipe. Heat trace tape is made of many layers that begins with the heat trace wire. The wire inside the insulation (typically 16 AWG) that heats up is surrounded by a conductive core. The conductive core is surrounded by a thermoplastic insulation. This has an outer copper overshield that is also in a thermoplastic insulation as an outer jacket to protect the inner layers of the heat trace tape. The photo shows a heat trace tape temperature controller that energizes the heat trace tape to protect the piping from freezing. In this particular case, the temperature controller controls the heat trace tape on a chilled water piping system and a hot water piping system. Tanks can also be wrapped with heat trace tape and then insulated for further protection. Continue reading “Heat Trace Tape Control for HVAC Piping” »
This domestic hot water mixing valve offers a way to temper the hot water coming from a hot water loop and boiler. It is very important to maintain the appropriate and desirable temperatures of water used for domestic water use. First you want to maintain a safe temperature so people are scolded by extremely hot water temperatures. Hot water boiler loops generally work on a temperature of 180 degrees Fahrenheit and this temperature is too hot for human contact without scolding or seriously burning the skin. A mixing valve is used in the loop to maintain a safe temperature for human comfort. The hot water is mixed with cold water at the mixing valve and the result is the temperature dialed into the mixing control valve which has a range of 120 degrees to 140 degrees if used for domestic hot water applications. Other mixing valves can be purchased that will give a whole range of temperatures including mixing valves that can be controlled by PLCs or DDCto maintain specific temperature ranges for whatever the desired temperature is for the application. Continue reading “Domestic Hot Water Mixing Valve and Domestic Storage Tank” »
This photo shows the boiler cabinet open exposing controls and basic components of the boiler. The module on the left is the ignition control module which controls the sequence of operation for ignition and burner controls of the boiler. When the boiler is enabled to run usually by a thermostat or controls the ignition control module begins the process of firing the burners. The process typically begins by having the ignition module check the safety circuit to ensure all safeties are normal and not in alarm. This includes energizing the inducer or forced draft fan motor and any limit switches and a flow switch to ensure the boiler has water flow. The inducer or forced draft fan motor causes some pressure switches to close proving that combustion air is available and that the combustion gases will be exhausted when the burners fire. After the safety circuit has been proven to be okay the ignition control opens the gas valve while simultaneously activating the spark ignition to ignite the gas now being supplied to the burner(s). Once the burners ignite the fire is proven, usually by a state of the art flame sensor, the ignition control module deenergizes the spark ignition. As the water heats up it is sense by an aquastat or temperature sensor. When the temperature of the water reaches the set point of main boiler controller the ignition control closes the gas valve and the main burners shut down. The inducer or forced draft fan motor continues to run for period of time so that all the combustion gases in the system are purged up the boiler flue or boiler stack.