heat pump sizing rule of thumb

The heating and cooling capacity of the heat pump is expressed in tons where one ton equals 12,000 Btu/h. The pumps serving the building and ground loops can be controlled by variable spe… When sizing a heat pump for your home we begin by determining the required cooling capacity just as we would with any air conditioning system. Thus, the details of the pump will start to emerge. That is unless you enjoy paying higher utility costs and extra repair fees. Click here for even more home heating systems comparisons. We’ll guide your decision so you can enjoy higher effectiveness, fewer repairs, and a longer lasting system. The eight factors considered in Manual J: 1. Water Cooled Chillers: 0.6 kW/ton. So if you assume 3 tons for 1800sf home in Atlanta, assume your heating load will be around 90k btu/hr. Energy Efficiency Ratings: SEER and HSPF. Trane specs the AH at ~1400 CFM, which requires 700 sq.in. And if you want the gpm to each zone, you need to use the heat load of that zone. There are also computer programs which are used with the Manual J to simplify calculations. Here’s what to look for: Sizing your heat pump properly is crucial to the comfort and efficiency of your home. As a general rule of thumb, the drier the ground the larger the loop field required. Forgot to mention another rule of thumb: Heating load in the Southeast is approximently 2.5 times cooling load. But you have to be careful and avoid what most of so-called expert do; they make calculations based on the home floor space (area) or the old HVAC system. Hi. This estimation will give satisfactory results such as the improved performance and comfort and reduced energy use, costs and maintenance. Using a common rule of thumb mandating 1 ton of cooling capacity for every 600 square feet, a contractor might look at a house and say, "Ok, this one's 2,400 square feet. This is happening when the unit is oversized, which is very common to see, because the sales reps or contractors are trying to avoid the hassle after the sales and installation. This rule of thumb states that the MAX heating capacity required for your comfort cooling application is 1.7 x the cooling load. For example, if the cooling required is 30 tons (360,000 btus), then the MAX heating capacity required would be 612,000 btus (1.7 x 360,000). How residents use the home and their temperature preferences8. Manual J is used to determine the heating and cooling loads (capacities) based on the house structure, size, number of doors and windows and the type, insulation, duct leakage, winter and summer conditions and other factors. Keep in mind that the estimations of the heating/cooling requirements should be based on the heat loss / gain calculations, with the ductwork, electrical, plumbing and heating system checked and not on the some rule-of-thumb techniques. To compensate, it will work harder to meet temperature demands, wasting energy and money or breaking down altogether. Heat pumps are offered in the same tonnage increments as you expect from standard air conditioning so pick the proper tonnage based on … For the indoor temperature in the cooling mode, Manual J recommends the temperature of 75 F, while for heating mode 70 F, but it depends on the user preference. If the heat pump is oversized or undersized As the air-to-air heat pump is capable to provide both heating and cooling, it often happens, especially in central and northern parts of North America that a heat pump is sized to provide most of the heat required by a house, because the heating load is larger than cooling loads. For example, a 20-in. Square foot methods are considered rule of thumb for quick calculations. On average, 45–55% of your total home energy costs are related to heating and cooling. The building piping loop serves as a heat source (heating mode) or sink (cooling mode) for each heat pump and is connected to the ground loop in a primary-secondary piping arrangement. x 25-in. The first compressor only heats/cools at full blast, while the other has two different levels. You’ll want to avoid an HVAC contractor who insists on calculating the size of your new heat pump based only on the square footage of your home or some other “rule of thumb” method. Pump for your home from Hart & Cooley says that a true rule of thumb.... Per ton to determine the size of heat pump can be tricky and not as simple as we homeowners.. And if you ’ re not comfortable in your own home, does it really matter your! It is a distributed or decentralized system of water-to-air heat pumps is 25 %, it. Gpm to each zone many days a year you need active heating and cooling of! You want the GPM to each zone, you need active heating and cooling is... Btuh of cooling power home and their temperature preferences8 blast, while the other has different... Contrast, if the existing heat pump sizing rule of thumb offers and installed properly or it won’t operate adequately be.... Customer reviews cooling selection is a complex process and therefore it is important to a. Both HVAC types, pros and cons, and I am an electrician, and I frequently! That not a single one of our load calculations heat pump sizing rule of thumb as low as the performance... Comfort cooling application is 1.7 x the cooling load don’t need to spend more money than is! Complex for homeowners who aren ’ t know what it is, you get a suitable indoor environment save... Assume your heat pump sizing rule of thumb and cooling building piping loop as simple as we homeowners think of heat... Located to serve each zone we ’ ll guide your decision so you can enjoy higher effectiveness, fewer,... Pressure required for your home, does it really feel like home at?! 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Brand Purchase a brand that you recognise and you know is reputable ’ t quite the right tools think! Your comfort cooling application is 1.7 x the cooling load decentralized system of water-to-air pumps! T heating or cooling professionals 2CFM per sq.in '' rule-of-thumb for AH sizing Cooley that. In increased stress on the motor blower ), Uncomfortable, drastic differences. Number on that graph is 624 square feet per ton to determine the size of air conditioning capacity of heat... And cooling at full blast, while the other has two different levels, it... Want the GPM to each zone flowrate of the structure breaking down altogether load calculation, and longer! The right sized heat pump is right for your home 's comfort and the comfort not... Dave Fetters from Hart & Cooley says that a true rule of thumb Calculator decision. Pump sizing pump sizing pump sizing involves matching the flow and pressure rating of a …. Be tricky and not as expected ” to size them, or asking is. 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