The ZIF-8 and UiO-66 membranes showed a LiCl/RbCl selectivity of ~4.6 and ~1.8, respectively, much higher than the 0.6 to 0.8 selectivity in traditional membranes. A prototype has been developed that captures water vapor from the air, and then releases it with the application of a smaller amount of heat compared to existing commercially available technologies. Such MOFs could also be used to increase energy efficiency in room temperature space cooling applications. Space cooling was responsible for approximately 3% of the 2016 total world primary energy use, and demand in developing countries is increasing at ever greater rates. Therefore, air conditioning efficiency is a very desirable area for reducing future increases in energy consumption and CO2 production from producing that energy. When cooling outdoor air, a cooling unit must deal with both the sensible heat and latent heat of the outdoor air. Typical vapor-compression-air-conditioning (VCAC) units manage the latent heat of the water vapor in air through cooling fins held below the dew point temperature of the moist air at the intake. These fins condense the water, dehydrating the air and thus reducing the heat content of the air substantially. Unfortunately, the energy usage of the cooler is highly dependent on the temperature of the cooling coil and would be improved greatly if the temperature of this coil could be raised above the dew point. This makes it desirable to handle dehumidification through means other than condensation. One such means is by adsorbing the water from the air into a desiccant coated onto the heat exchangers, using the waste heat exhausted from the unit to desorb the water from the sorbent and thus regenerate the desiccant for repeated usage. This is accomplished by having two condenser/evaporator units through which the flow of refrigerant can be reversed once the desiccant on the condenser is saturated, thus making the condenser the evaporator and vice-versa. The conclusion is that a desiccant which can adsorb a large amount of water and then easily release that water would be ideal for this application. With MOFs’ extremely high surface areas and porosities, they have been the subject of much research over the past decade in water adsorption applications. Additionally, there are a variety of chemistry options which can help tune the optimal relative humidity for adsorption/desorption, and the sharpness of the water uptake. Some MOFs also exhibit spontaneous electric polarization, which occurs due to the ordering of electric dipoles (polar linkers or guest molecules) below a certain phase transition temperature.