Humidity issues with ducted Mitsubishi heat pump

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Humidity issues with ducted Mitsubishi heat pump

Hello, wondering if others have experienced difficulty maintaining comfortable humidity using a Mitsubishi hyper heat ducted system.

I think the heart of the matter is that they try to be too efficient and can maintain temp well but ignore the importance of humidity.

I have an old inefficient carrier ac downstairs which works great at keep the lower level cool and dry.

My upstairs unit is the heat pump.

I tend to use dry mode as it seems to work better than cool mode since it will try to run longer by keeping the fan speed low and the coil cold.

However, it only really significantly brings down humidity when it's first turned on.

And it does this really well initially.

It can drop eh by like 10% in an hour.

You can repeat this effect by continuing to lower the set point but then you just end up chasing uncomfortably cold temperatures to meet humidity.

If I set it at 74 it will cool until it hits 71 degrees, then shut off and kick back on when it reaches 73.

I could run a portable dehumidifier but they are loud, need to be emptied often unless you have a drain nearby, and consume lots of power.

If I could just hack this thing to run less efficient, ramp up the compressor hit a set point shut off and do it again I think It would be more comfortable.

Or come up with a way to schedule it so that the set point is at 74 then shuts off at 73, unit waits to turn back on at 75 and repeat.

Any thoughts or suggestions?

Thanks.

Question from user Ok-Swan2736 at heatpumps at reddit.

Answer:

Dry mode is 100% cooling.

It could also be that your unit is oversized.

You satisfy temp setpoint before pulling any moisture out of the air.

This is not the fault of your unit, but of your installers system selection.

Answer from user rayinreverse at heatpumps at reddit.