October 30, 2025Oct 30 Author 4 minutes ago, JohnMo said: Stick Aircon in - in the house that is, not the airflow. Leave ventilation to do ventilation. Or if ASHP just install fan coils in the upstairs rooms for heat and cool. Tricky to decide the best solution. If we go Air con then a. The cost and b. We're only doing ufh on gf so then no option for supplemental heating on ff&sf. Yes, ashp but installed quote for (8) heat coils is 10k! If its that much we could get an mvhr heat/cool module and as installing the ducting anyway can upgrade to 100mm insulated ducts. But, is it as good as heat coils??? How easy are the heat coils to install? How do you account for them on the ashp sizing?? So many questions.....
October 30, 2025Oct 30 14 minutes ago, Jolo said: built-in pre-heater turns on. I don't have a pre heater at all - I just rely on the inbuilt settings "During very cold weather, the Frost Protection Program will detect temperatures that could cause ice to form inside the unit. It will reduce or stop the supply ventilation rate, thus allowing the warmer stale air to raise the temperature within the unit cell to such a level that prevents the formation of ice. As temperatures rise the Frost Protection Program will increase the supply ventilation flow rate back to the commissioned settings." Have noticed as it gets colder outside, inside humidity drops, so don't see any negatives using the in built first protection.
October 30, 2025Oct 30 15 minutes ago, lizzieuk1 said: b. We're only doing ufh on gf so then no option for supplemental heating on ff&sf. Aircon does both heat and cool 16 minutes ago, lizzieuk1 said: heat coils What exactly do you mean by heat coils? Do you have an example of what they quoted?
October 30, 2025Oct 30 Author 1 hour ago, JohnMo said: Aircon does both heat and cool What exactly do you mean by heat coils? Do you have an example of what they quoted? Sorry, i meant fan coil unit!
October 30, 2025Oct 30 Two sorts of fan coils for ASHP a wall mounted unit, that heat and cool, something like this - one needed per room Or a multi room unit. Which you would duct to rooms similar to MVHR, but everything is sized to suit heating and cooling 1 hour ago, lizzieuk1 said: How easy are the heat coils to install? How do you account for them on the ashp sizing?? Install depends but no more complicated than a radiator. To heat pump you determine heat loss, how you deliver heat has little bearing on size of heat pump. I wouldn't size for cooling only heating, which is more dominant duty.
October 31, 2025Oct 31 @JohnMo - this kind of thing for multi room? https://www.abilityprojects.com/fan-coil-units?gad_source=1&gad_campaignid=22492647782&gbraid=0AAAAA_dPIDvt0GTJyd8qM3Coah64cNGF4&gclid=EAIaIQobChMIuYasioPPkAMVepNQBh1NuhvrEAAYAiAAEgJza_D_BwE How does the ducting compare to MVHR? Much bigger?
October 31, 2025Oct 31 24 minutes ago, Alan Ambrose said: How does the ducting compare to MVHR? Much bigger Yes, flow rates are higher
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