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So air-conditioning system, which are air-conditioning system: Monoblocks – the most common air-conditioning. These include windows and mobile systems, split systems – more complex and the most common. Split – means separation of inner and outer blocks. Vary depending on the type of indoor units: wall, wall, ceiling, cassette, ducted, multi-split systems – more complex systems. They to a single outdoor unit connects several (5) indoor units. Indoor units are the same as in conventional split-systems, Multizone system – the most advanced systems.

They single outdoor unit to join a lot of (40) indoor units of different types and capacities; chiller-fan coil system. A system in which the cooling agent is water, and in which one outdoor unit (chiller) connected an unlimited number of indoor units (Fan coil) at any distance, precision air-conditioning – special systems for premises with strict temperature and humidity, Window air conditioners most common type of air conditioners. It is no longer so popular. He was faithful, mainly southern regions. In one unit combines all the elements: the compressor and heat exchanger and fan.

Advantages: cheap, compact, and sometimes solve problems of partial ventilation Cons: high levels of noise are taken of the window, "stealing" the light of day, must 'redraw' the window frame, you can not block the air-conditioner, such as curtains, or comfort will be created in the space between the window and curtains, but not in Indoor and Mobile air conditioners in demand when the installation is impractical stationary air conditioning. For example, in the country, in a rented room. Advantages: does not require installation, easily transported from place to place; have small dimensions and weight; Disadvantages: not very effective in a large room, noisy, the price is comparable to the split-systems, if the volume of condensate trap is small, it is necessary every two to three hours to drain the water manually to any premises are suitable: apartment, villa, office.

If two opposite edges of the screen fixed tube and bar, the edges left free to hold in even more complicated. After multiple folding edges inexpensive screen may be slightly stretched and take a wavy shape. Stretch 'stretched' so easy mobile web Tube is more complex than in fixed. If allows the interior space, the best solution would be to establish 'permanent' screen – which is not removed and do not fold. The canvas is stretched on the screen of the special frame, which guarantees absolute flatness and tightness throughout the life cycle. A variety of designs, materials and colors will fit the frame so the screen in any room. For a rear projection screen so in most cases the only possible solution. In addition to the usual direction of projecting all of the direct projection, the projector and the audience are on one side of the screen, use the reverse or rear-projection (rear projection).

In a rear projection projector located behind the screen, running up to the light. It is on this principle works the usual projection TVs or new laser TVs. Choosing the screen, you must consider to what type of projection will be used. If the projection screen to direct can be absolutely transparent and reflection on the work, then back projection using a different type of fabric. We can not say that in the second case, the transparent screen – with full transparency, we would simply not see the image on it. High-quality screen for rear projection on the contrary – the darker it looks better.