I did not see any reference to my question and would appreciate a response as soon as possible, as due to medical situation, have to make a decision soon. We own an OLD house with 13′ ceilings in a large part of the home and 11″ ceilings in the LV/DR and BR. We are oscillating on where to place the ducts….Floor or ceiling. It appears to be counterproductive to me to put the duct work in the ceiling since it will have so far to go. We are looking for the most cost effective, not upfront cost but operating cost, solution. In addition, we are considering DF heat pumps. The house will need 2 or 3 to be zoned correctly. Please let me know about the duct placement and thank you for your help? Continue reading “Duct Work and High Ceilings” »
The variable air volume box or VAV box is a commercial solution to adding multiple zones to large buildings. VAV boxes offer zoning solutions so that separate zoning demands or temperature selections can be maintained in different areas of the building. If the president of the company wants the temperature in their office to be 70 degrees Fahrenheit but the vice president wants their office to be 74 degrees Fahrenheit then it is possible with the VAV zoning system as long as their VAV boxes are on different zones. This particular VAV box in the picture is not fan powered. It relies on the main VAV air handling unit to provide all the air. Generally, when a fan powered VAV box is calling for heat the damper inside the VAV box closes down so that minimal CFM’s are coming through the primary duct from the air handler. The fan turns on an pulls air from the plenum space above the ceiling. This plenum air is normally warmer than the air inside the occupied space. The heating system kicks in and adds heat to the air until a setpoint is attained. The heat for a VAV box can typically be a hot water coil or electric heat strips. The VAV box in the picture has hot water reheat. Continue reading “Variable Air Volume Box VAV Box Hot Water Reheat” »
Unit heaters are used in various places to protect equipment and provide comfort to occupants. This hot water unit heater provides protection for a mechanical room where there is a large air handler and other associated equipment in the mechanical room. This hot water unit is controlled by DDC. A thermostat on the wall detects the temperature of the mechanical room. The DDC system will maintain a temperature set point by energizing the hot water unit heater fan and modulating the hot water valve open on the hot water piping. The actuator and hot water valve can be seen in this photo on the right lower half of the hot water unit heater. The valve is a two position valve so it is either open or closed with no modulating the valve on the unit heater. Other unit heaters for heating mechanical rooms or providing comfort include electric units heater when hot water is unavailable, gas fired unit heaters when gas (either propaneor natural gas) is available, and infrared unit heaters typically found in large garages or warehouses for basic comfort of workers in those spaces. There are also steam unit heaters that utilize steam and a steam coil for heating spaces where steam is available. Most unit heaters are forced air unit
Air Handling Unit Components: Air Handling Unit Heat
There are many different types and arrangements of heating systems for air handling units and these types of heating systems and arrangements of heating systems vary from commercial to residential. Some air handling units do not have any heat source inside them at all but have remote heat for zoning. The air handling unit provides the air flow and the remote heaters provide heat for zoning. Sometimes the air handling unit is a VAV air handling unit and other times it is just to provide air for a duct heater whether the duct heater is gas fired or electric. For air handling units which some have heating systems inside the five main ways of providing heat for air handling units are:
Heat is energy and when we produce heat we need to use energy in its production. There are natural methods for producing heat without burning or using fuels but these methods are not practical or available to the general populace for residential, commercial, and industrial use. The production heat, whether for residential, commercial, or industrial uses, uses energy and energy costs money. It is thereby necessary to have reliable and proven methods of measuring the amount of heat produced using a specific quantity of energy. Employing these reliable and proven methods we can also use the data to determine the best methods of producing heat for homes, businesses, and industry. Continue reading “Air Conditioning and Heating: Heat/Energy Values” »
Thermostat Selection – White Rodgers & Honeywell Thermostats
Which type and brand of thermostat do you get when selecting a new thermostat? To do that you have to know what kind of HVAC system you have installed for your heating and cooling system. Do you have a boiler with baseboard heating or radiators with the boiler combination? In addition to the boiler do you have an air conditioning system with duct work or a mini-split ductless system? Do you have a heat pump system? Do you have electric baseboard heating? Do you have an air conditioner system with electric heat? It is important to know the answers to what kind of HVAC system you have installed in your home.
When you know the type of air conditioning and heating system you have then you can go to the local hardware store and purchase a new thermostat. Opinions varying as far as brand of thermostat is concerned but typically Honeywell thermostats and White Rodgers thermostats are the best with the author of this article leaning towards the Honeywell thermostats if I had the choice of thermostats. Once you are in the hardware store and find the thermostat section you need to read the package and compare it to the type of HVAC air conditioning and heating system you have. All the information should be on back of the package and which system is appropriate for each particular thermostat.
Be aware that a heat pump thermostat is different than a thermostat for an air conditioner with a gas furnace for heat. Additionally electric baseboard heating usually requires a high voltage thermostat. If you have electric baseboard heating make sure you turn the power off before attempting to change the thermostat. It is a good idea to turn the power off to your HVAC system if you change any thermostat. Good luck and happy thermostat shopping.
Thermostat Selection – White Rodgers & Honeywell Thermostats
HVAC Ductwork delivers the conditioned air to the spaces. The Air Handling Duct channels this conditioned air to spaces where it is needed and then a return duct channels the air back to the air handling unit duct for re-conditioning. The return ductwork has a negative pressure while the supply ductwork has a positive pressure. In commercial systems and tight residential homes it is necessary to add fresh air to this conditioned air so the air remains fresh and healthy for the occupants of the structure. This is required by the mechanical code and often this air comes through ductwork from the outside. Continue reading “HVAC Duct Work – Air Handling Unit Duct – Air Handler Duct Work” »
Heat Pump Thermostats
To the average person a HP thermostat can be a very complicated thermostat compared to the typical thermostat which serves an air conditioning system with gas, electric, or an oil furnace. Of course the HP thermostat typically has more wire terminations than the regular thermostat. It has more switches to control emergency heat and some even have lights which will indicate that the auxiliary heat and/or emergency heat is functioning. Most HP thermostats are two stage thermostats for the heating mode and a single stage for the cooling mode. These two stages in the HP thermostat for heating gives the thermostat the ability to run two different sources for generating heat (typically only with air to air systems which are more common and prevalent than water to air heat pumps). All thermostat manufacturers offer single and multi-stage heat pump thermostats including Honeywell, White Rogers, Robertshaw, Lux, and Maple Chase.
High Performance HVAC Air Conditioning & Heating: Sun Porch and What Type of HVAC System Needed?
The Sun Porch or Florida Room: What Type of HVAC System Needed
15) We added a 300 sq.ft. of living space to our home as a sun porch. How do we effectively, efficiently heat/cool this space? We’ve been pitched several options. 1) Use existing with a manual duct damper to the new sun porch. 2) same as above but use a zoned approach w/auto dampers for main house 1st floor and sun porch plus separate thermostats. 3) HVAC with new units for sun porch (e.g., radiate, forced air, etc)
Sun porch is a 15×20 fully enclosed insulated space with 6 ft. casement windows on three sides. The forth side is the main house wall. Main house is 2 story, 1600 sq ft. per floor, gas heated with 2 Trane furnaces and cooled with 2 Trane central air units. The Trane equipment is new being installed in 2007. Continue reading “What Type of HVAC System Needed for Sun Porch” »
Selecting the Replacement Thermostat
If you need to install a new tstat then you have found the right place to learn. Below we will describe to you how to hook up a digital thermostat, hook up a programmable thermostat, or hook up any type of thermostat for that matter. Whether the old thermostat is bad or not if you simply want to replace your old thermostat and hook up a new thermostat the first thing you need to take into consideration is to select the right replacement thermostat. To select the correct replacement thermostat you need to know what kind of HVAC equipment you have in your home or where you want to hook up the new thermostat. There are numerous types of air conditioner and heating combinations so in this article we will cover a basic gas furnace and air conditioner split system HVAC system. For hooking up a new thermostat similar systems to the air conditioner/gas furnace combination would be:
If you do not know what kind of unit you have take a look at the paperwork from the last time the unit was serviced. Perhaps it will show the type of equipment on the service ticket where the unit had maintenance. It is assumed that most people will know what kind of unit they have so that they can select the proper thermostat.