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Teddy Bear

There are two kinds of heat, radiant and sensible.

sensible heat contact material. Heat warms the air. The warmed air heats material it comes in contact. Radiant heat warms solid material...

The one person in the space needs a fresh air change in 3-5 hours to purge indoor pollutants. Five occupants need a fresh air in 3-5 hours to renew oxygen. Oxygen in outside air is 20%. Humans need...

You know,, we should establish a "Fool-Around Hall of Fame"!

Regards Teddy Bear

My kind of a guy!

Teddy Bear

Consider a whole house dehumidifier with fresh air with focus on the basement space. Air circulation in a space with a tenant requires aggressive air change like a fresh air change in 3-4 hours. The...

Some info on how you are going to install the dehumidifier.
Ideal to have the dehumidifier connected to the open part of the home and fresh outside air to purge indoor pollutants and renew oxygen....

What region of the world is this space located? Your looking a specific humidity levels? Will your space need fresh air to purge indoor pollutants and renew oxygen? Do you want to maintain 50%RH...

An electric stove provides heat only to the home (do not run the exhaust fan). The heat in the home causes the temperature in the home to rise. Intern the a/c runs more removing moisture while...

Sounds like the grills inside the conditioned space are sweating. You are in a unique weather where the air outside is very damp but the a/c is not running enough to dry the house out.

You have...

Yes, some air will move backward, the dry air will dry the wet coil and return side of the a/c slowly. This is ok.

Because you are returning air from the open part of the home, most of the air...

Poodle Head Mikey got this right. Suction pressure control valve also can be used to avoid overload.

Regards Teddy Bear

I agree but the velocity is critical. This works when the a/c blower is on high flow, not when set on a lower air for recirculation mode. With this setup, it does not make any difference.
...

No backdraft damper required.

You can probably turn the dehu fan on/off and damper open/close with remote control.

What is your current outdoor dew point and indoor CO2 ppm?

Regards Teddy...

Prefer check damper in the supply duct between the cooling coil and the dehumidifier supply.

Keep us posted on how your home responds.

Regards Teddy Bear

Your choice. We see many Infinity installs with the dehu supply into the a/c supply and using the dehumidifier blower only. The Infinity a/c blower on "low" 24 /7 will use a small amount of...

The larger 5 ton coil will remove more moisture with a good setup than the 4 ton coil.

Regards Teddy Bear

Good idea. Also suggest a large charcoal filter for odors and gaseous pollutants. A motorized damper in the fresh air duct controlled by a CO2 controller set at 750ppm CO2. No need to run the a/c...

You missed one point. You need a back draft damper in a/c supply or return to stop any backward air flow in the duct system when the a/c is not running.

You need a one back draft damper on the...

You can get a good dehumidification rate by adjusting the amount of air that the blower moves through the cooling coil. A proper install any a/c requires adjusting the air flow through cooling coil....

Open windows allows high dew point air into your home evenings. The materials absorb the moisture. Your a/c has to remove the moisture while cooling the next day.

Better to keep the windows...

Infinity has a great VS blower that runs (low/med/high) when not conditioning.
There one negative with your setup. If you allow dehumidifying while the a/c may be cooling, the dry air from the...

You are over reacting to the outside air. The a/c will over-dry your home during high sensible cooling loads. Your home will dry a little lower than 50%RH. Might get down to 47%RH. Moisture from...

Settle down! No need to run the dehumidifier when the a/c has significant sensible cooling load. The a/c will remove 3 lbs. per hour per ton of cooling, which enough dehumidification to maintain...

The Santa Fe Ultra 120H has a strong fan. Seldom any problems with check dampers. A couple ways to avoid a/c fan need to run. If the dehumidifier return comes form the open part of the home and...

Adding filter media over the air inlet to the unit allows slowing air flow enough to get the moisture level in the space that you want. This also slow sensible cooling rate. A real fix for slightly...

Fresh air change in 2 hours, could be a bath fan. Also a 70 pint free standing dehumidifier if art is involved. Through the wall a/c or mini-split a/c.

Regards Teddy Bear

Climate and concern about indoor air quality and comfort? Number of occupants? Occupied 24/7 or unoccupied during the day?

Teddy Bear

Trust me, 67^F salt water can generate a 75^F dew point. If you are getting a fresh air change in 3-5 hours and you are near the water, you can have a damp house when the a/c does not have a...

Most dehumidifiers have a 24 volt power supply for remote controllers. Connect the 24 volt power supply to the relay in the dehumidistat switch in the thermostat of %RH controller and route back to...

Coastal can be tricky. Any weather make you home damp and not the right temp/%RH? You may want to discuss adding humidity control beyond a/c cooling evenings and rainy days. More and more near...

I have one VS Carrier. Distribution of condition is lousy on all but the high speeds. Get the best single speed a/c on both floors with a VS blower in each. Add a small whole house dehumidifier...

HEY, WE ARE TRYING HARD.

Regards The Gang!

I am +85 senior and do not work for any company. My suggestion was that during the coldest winter weather, natural ventilation increases to the point where you may not need any fresh air...

The idea that the drain trap dries out during the heating season and allow back flow of sewer gas may be an idea. If the end of the condensate drain is exposed, try making a piece of tape on the end...

A bath fan sounds good for those special occasions.

Keep us posted.

Regards Teddy Bear

Four occupants plus a dog, Ok. At +-1000 ppm CO2, would suggest about 80 cfm of fresh air passing through the home. I assume a small dog.

If you are getting 80 cfm, when occupied, during cold...

The main point is that the air flowing through the cooling coil should be adjusted to provide the ideal humidity +-50%RH during significant sensible cooling loads. If your stuck with the 1" filter...

Fresh air ventilation to support life is a minimum. Most suggest a filtered, fresh air change in 3-5 hours when occupied. Of course heating and cooling is expected. Supplement dehumidification...

Did you ever to CO2 control of fresh air? This could save some energy and avoid over-ventilating. The Broan's Overture is a little more complicated but reports are good.

Issues???

Regards...

Try operating with the a/c blower t-stat "on". There must be a damp spot the is not drying out between a/c cycles. Things like the drain pan not pitched to the drain and moisture blown off the a/c...

Hope this clears the confusion, if not, restart the question.

Regards Teddy Bear

This refers to reverse air flow which may not be ideal.

The choice of dehumidifier size has to do with occasional +55%RH and the amount of fresh air desired. Long term, these only during...

With a goodly amount of air tightening, I would suggest a whole house dehumidifier with make-up fresh air ventilation to purge indoor pollutants and renew oxygen. You will find that a properly...

How does an HRV help with this problem? Suggest a 10" make up fresh air duct in the kitchen near exhaust hood. Might surround the stove with several smaller make-up grills around the stove. A...

Closed cell foam insulation with a radient barrier of the sunning side of the insulation is a good start. If close to the water, You need to focase on the a cold cooling coil temperature to remove...

You are on the right track. What is your objective? Suggest a a <50%RH indoor fresh air with +-75^F temperature. Use a CO2 controller for fresh air ventilation fresh air ventilation whenever the...

Does the fan operate continuously?

Most sensors are inaccurate at near condensation. With a fan "on" and the compressor "on/off" by t-stat or pressure switch, The %RH will be all very when the...

Well you are reminding me something that I forgot, patience.

How many occupants do you have in your winter setting while 1,000 ppm CO2? Knowing the CO2 levels and the number occupants allows a...

The key is to blend the fresh air with the house air, filterer the blend through a merv 13 air filter and circulate filtered, dry air throughout the home a steady pace when the home is occupied. The...