I have a brand-new 5000 BTU Frigidaire window air conditioner, and it seems to work fine except that it doesn't reduce the humidity in the room. I turned it on last night, and the temperature was 81 °F with 63% humidity, and when I woke up this morning it was 72 °F with 70% humidity. I thought that dehumidification was necessary in how air-conditioners worked. How could an air conditioner cool the air without removing the moisture? Don't forget that the percentage humidity is RELATIVE. Cold air cannot contain as much moisture as warm air. For the same amount of water in the air, the relative humidity will increase as the temperature drops. By consulting a psychometric chart, I see your overnight run removed 19 grains of water per pound of dry air. If you rewarmed the morning air back to 81 deg F, the relative humidity would be about 52%. Or, if you cooled the initial air to 72 deg F without removing any moisture, you would get a relative humidity of around 88%. So despite the higher relative humidity reading, moisture was removed.

The moisture removed is a function of the temperature of the evaporator coils in the A/C unit and the volume of air flowing through it. As bib pointed out, the unit may not have been actually running that much, reducing the volume of air passing through the coil, and thus minimizing the dehumidification effect. If you continue to cool the same air and avoid introducing additional moisture, the humidity level will eventually be reduced. It will take some patience. Air conditioners need to be sized to the room they are in. The dehumidification process takes some time, so if you have an air conditioner that is more powerful than the room calls for, the compressor shuts off before the dehumidification takes place. A 5000 btu unit is considered appropriate for a room 100 to 150 sq. ft. That is a pretty small room, but if your is smaller, that might explain it. Also, be certain that the external air vent is closed, the baffles on the sides fit the windowframe tightly and that there is a foam filler between the raised sash and the outer window.

If these are not done, moist outdoor air could leak in.Browse other questions tagged repair hvac humidity or ask your own question.Finding the best window fan available wont be too much of an issue as they all more or less come with similar features and options. Of course, there IS that little thing called reliability. All of them come with motors and moving parts and when you factor in that many brands simply prefer to use cheaper parts you may have a recipe for disaster if you don’t do your proper research. One of the best features to owning a window fan is in the cost savings when compared against the cost of running central air conditioning or using a portable AC unit. If you can stand to replace cold air with fresh, circulated air then a window fan will be ideal for your needs. Of course, you’ll also be doing your part in energy conservation – which is more costly during peak hours. This is the obvious benefit of operating a window fan. Many window fans utilize independently operated fans where one will operate as an exhaust while the other supplies fresh air from the outside.

Window fans are ideal for Kitchens, Bedrooms, Living Rooms, Laundry and Basement areas.york ac package units Supplement to an Air Conditionerhow long does the average ac unit last Air conditioning is expensive as we all know, but in warmer temperatures it would be somewhat inefficient to use them around the clock. ac unit american standardAn excellent alternative is to use a window fan at night to take advantage of cooler outdoor temperatures. It doesn’t matter if you’re living with a smoker or cook a lot of meals at home, odors linger without the proper circulation. Window fans offer the ideal solution to quickly ridding any area of strong, unwanted smells. Window fans come with adjustable panels, which means they easily fit most type of windows.

That also makes installation hassle free. There are a few options you’ll want to familiarize yourself with when looking to purchase a window fan. Independently Operated Blades – Air Exchange In these window fan reviews you’ll only find Dual Blade fans, but single blade options are definitely available. Twin fans obviously blow more air and also routinely feature independently operated blades, which quickly exhausts stale air while at the same time replacing it with fresh, outdoor air. Here’s a tip on effectively using a window fan during the summer. Also, consumers have long had problems with the flow strength and noise levels created by window fans. They can be on the loud side, so comparing units based on what reviewers actually had to say about these products gives a better impression of the quality of air flow and level of noise you are likely to expect from each window fan. Lastly, there are a few different options and features that come with each window fan that separate itself from the competition.

The more favorable units will include things like Remote Controls, Thermostat for efficient room temperature control and Digital Displays for quick temperature reference. Sometimes products just don’t work right and anything with a motor has even more potential to fail. Even the best window fan is not exempt from early wear and tear, product defects from delivery, etc. Here are a few of the most commonly reported issues with window fans. Bob Vila – How To Use A Window Fan Buying a window fan doesn’t guarantee cooler temps in your house. There are of course several ways to maximize your window fan for all its worth, like removing it first thing in the mornings before temps rise or creating enough positive pressure to keep the bugs out. Holmes is one of the more popular indoor air flow product manufacturers and their Dual Blade Window Fan with Thermostat is rated the best on our list. It offers Independent Fan Operation for Intake/Exhaust mode, Electronic Controls, a Thermostat that turns the unit on/off at desired temp, 2 Speed Settings for preference and comes with window extender panels.

It fits most double hung and slider windows. Pros: 2 Speeds – 8.5″ fan blades – Thermostat to maintain temp – Two way fan operation – Remote control Cons: Not overly strong air stream – Multiple complaints about fan noise – May make rattling vibration noise from off-centered fan blades Though the Holmes unit is more budget friendly, one of the top selling units overall is the Bionaire Twin Window Fan. This unit comes with all the bells and whistles. It has an Electronic Control Panel with LCD Screen, 3 Speed Operation, Independent Fan Controls for simulataneous Intake/Exhaust, Remote Control for ultra convenience, Thermostat that turns on/off at desired temp, and comes with extender panels . Designed to fit double hung, vertical and Casement windows. Pros: LCD Screen – 3 Speeds – Thermostat to maintain temp – Remote control to turn off from bed – 8.5″ blades – Quiet operation Cons: Some units die prematurely – Makes a beep with each setting change – LED lights always on – Batteries not included for remote

Lasko, of course, is another top name in the indoor air flow marketplace. Their 8″ window fan unit also offers independent fan blade operation to eliminate that stale, indoor air. It offers simplicity with it’s 2-Speed operation, adjustable Thermostat on the console and extender panels. It also includes snap-on feet for floor or table use. Pros: Adjustable thermostat – Intake/Exhaust air exchange – Solid air flow – Moderately quiet operation – Easily reversible Cons: Cheap plastic construction – Extension panels could be easier to adjust Optimus offers one of the best window fans at an affordable price with it’s 7″ unit. It has 2 Speed Operation with on-unit controls, has built in adjustable extender panels and comes with Carrying Handles and Feet for floor or table use. The fan is also reversible via manual control. Pros: 2 Speed operation – Good fan for the money – Clean looking design Cons: May have more fan noise than competing brands – Some weak flow complaints – Could be constructed beter