SÜDWIND: Ambientika ADVANCED - single room heat recovery ventilation (93%), 160 mm, 60m³/h, remote control

It took a while to get both of our two units in, get experience using them, and let them gradually stabilize the humidity level inside the house. They are doing what we wanted. They have greatly reduced the incidence and extent of condensation on our (poor quality, old double glazed) windows, clear out moisture from hot steamy sessions in the family bathroom far better than an extractor fan & open window, and reduced smells as a bonus.These cost more than other makes and models, but have features the others lacked. In particular, their heat exchange efficiency is unusually high. At low speed they are 3 decibels quieter. (Decibels are not a linear scale. To the human ear, that amount means they sound half as loud.) Their remote controls include a wonderfully clever & useful Standby mode. There is no need to choose a high-medium-low fan setting and hope that's right. Standby take a high-medium-low moisture target setting, then monitors indoor humidity and turns on air exchange only when humidity gets above threshold. It chooses the appropriate fan speed for the moisture level and adjusts fan speed as humidity comes down, until eventually it turns itself 'off' (to Standby) again. Humid warm air goes out from the house for 70 seconds, then air with lower moisture content (because it is cool) come in from outside for 70 seconds, picking up most of the heat left in the exchanger by the outgoing air. This is much more energy efficient than simply using extractor fans or opening windows, discarding fully heated air for completely unheated air.These units are intended to be set up per room. We have put one in the family bathroom upstairs and one in the kitchen downstairs. On each level, the unit is in the room where we usually introduce the most moisture into the air. We keep the door between those two levels closed, but doors within each level are usually open.The big test came when we cleaned the living room rug yesterday. Usually that would cause heavy condensation overnight on the lower half meter of our living room windows. Instead we got about an inch of it. The unit is in the back wall of the house. Those windows are on the front wall. These units are outperforming what they are designed to do, each taking care of half a house instead of just one room.With less moisture in the living area of the house, we should also have less of it migrating through the ceiling into the loft where eddies in air circulation at the peak of the roof allow condensation.None of the solutions recommended in conventional advice in the UK would be as energy efficient or as comfortable.NOTE: These are not a 'set and forget' appliance. Every couple of months we'll need to take the removable indoor face off the unit, pull the heat exchange insert out, use the vacuum cleaner to remove dust from it, put the exchanger back in place and put the face on again. It should take about 5 to 10 minutes.

Well designed easy install, 3 modes and quiet on the low settings

No holder for keeping remote control safe, to easy to loose

The media could not be loaded. I’ve got three of these and generally doesn’t do much in terms of reducing humidity. The one fan makes an extremely annoying noise which is different to the general sound that it should make and makes using it unbearable. I’d recommend just getting a full MVHR system instead. Was an absolute nightmare getting someone to core the holes in the wall as well so think carefully about that before embarking on this journey.