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You can certainly put the R30 batts in between the 2x6 collar ties, but it won't result in an R30 ceiling installation, due the thermal bridging of the collar ties and the resultant gap above them between the insulation batts. I think abetter plan might be to stuff the 6" thick insulation in between collar ties as normal, then lay another layer of 6" thick ...


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No one has talked about the roll around heat pumps that have a duct out the window. These have AC, dehumidify and heat settings. The heat is via an actual heat pump so is more efficient than a space heater. Worth considering for 1 room.


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Gotta love armchair quarterbacks. I live in the Caribbean. Houses are constructed of concrete block with stucco/parging covering the block. Roofs are usually terracotta tile or concrete tiles. Very few dwellings have an attic space to separate the exterior roof from the interior roof and insulation is a word that hasn't yet been defined here. Concrete stores ...


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208/120Y is cheaper for supplying condominiums because one neutral can carry the unbalanced loads of three ungrounded conductors. But for the consumer, the voltages difference of 208V vs 240V usually equates to the same overall wattage, with the only negligible concern being it takes longer for heating elements to reach their desired temperature. As for ...


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Volts x Amperage=Wattage I have a 220 volt device (motor, dryer whatever... it makes little difference for this example). Single phase device draws 43 amps (43 x 220 = ~ 9460 Watts or 9.5 KW) Same unit with 3 phase draws 25 amps (25 x 220 =~ 5500 Watts or 5.5 KW) *** The same amount of work is output with either unit despite the 3 phase using less power ...


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The standby losses you see quoted should conform to a testing standard that would allow deriving the heat loss coefficient. For hot water storage, I would expect typical tanks to have between 2 and 4 inches of foam insulation, so aged R-Values R10-R12 (hr*ft^2*F/btu)/RSI 1.76-2.11(K*m^2/W) on the low end and double that on the high end, with 2 inches being ...


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I would say a dehumidifier would not be a more efficient choice for summer comfort than turning down the thermostat on an A/C. Sure, the delta-T across exterior walls would drop, so somewhat less heat would seep in from outside, but as was already mentioned, the A/C then has to remove the dehumidifier's additional heat from the home (100% of the input power ...


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This article provides excellent information about maximizing thermal mass: Phase Change Materials (PCMs): There is growing interest in the use of PCMs as a lightweight thermal mass substitute in construction. All materials require a large energy input to change state (i.e. from a solid to a liquid or a liquid to a gas). This energy does not change ...



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