What dodges are used by unfair sellers of double-glazed windows, assort together with the expert of the Moscow society of protection of the rights of consumers Vladimir Prigozhin.
 1. Are absolutely tight and at the expense of it do not pass a cold in apartment!
Such windows does not happen. Other question, that modern windows approximately twice save up heat, than old "Soviet" more successfully. Besides they are is much better condensed. However there is also other party of a medal: the premise with such windows should be aired is more often. 2. Completely isolate any street noise. That still dodge. Low-frequency sounds - a tram, a jackhammer, a transport rumble, especially from multiton tractors - will be all the same audible. But good windows can essentially reduce them. Double-glazed windows with glasses of a different thickness will give additional effect at the expense of partial elimination of the phenomena of a resonance. Besides, to weaken a resonance the double-glazed windows broken on some sections will help - continuous big glasses in it only increase it. 3. The vacuum in a double-glazed window gives additional sound insulation. At double-glazed window manufacturing some depression inside is really created that glasses nestled on a framework more densely. However it not vacuum in the standard understanding. 4. The thicker a window, the better. Not the most true statement, based that air - the best heat insulator. Remember from a course of school physics the law конвекции - warm air rises upwards, and cold falls downwards. About the same principle works and in air space between external and internal glasses. Along internal (warm) glass air rises, and its place occupies cold, fallen downwards along external (cold) glass. Between glasses air circulation is formed. This kind of heat exchange gives the greatest losses of heat. That it did not occur, distance between glasses do just small, its increase can lead to deterioration of thermal characteristics of a double-glazed window. And утолщают a double-glazed window for the account большего quantities of chambers (layers of glasses). But the more chambers in a package, the it is more expensive. For Moscow an optimum variant (the price - quality) - a two-chamber double-glazed window (three glasses). 5. At us the cheapest windows - from $40 for square metre! Qualitative "plastic" cannot be cheap. At all manufacturers of the price respecting on windows about the identical. And concept «square metre» the abstract. Modern windows - the difficult design consisting of several tens of components. And their price cannot be defined only by the area. 6. Our double-glazed windows are filled by argon! It can be and the truth. But to check up, that in a reality is in a double-glazed window, difficult enough. You will not break some glass and the special device to define - argon there or air. Besides it is not too important. Heat conductivity of gases depends on their pressure. And air or argon inside - has no value. 7. Than thicker a profile and the more in it of chambers - the better. The profile initially passes heat much worse, than glass. Therefore there is no sense to increase its thickness. If the window also is «мерзнуть», on glass. And such frosts that the profile was chilled, at us simply does not happen. IMPORTANT Some sellers specify the prices without the VAT. Remember it. Specify, in how many to you installation and delivery of the ordered windows and all necessary complete set to them (window sills, отливы, transitive profiles, etc. will manage.) together with the VAT. Study marks By eye quality of a profile not to define. Attentively study factory marks on an inside of a window box (at some foreign manufacturers it becomes directly on a profile). On it there should be a brand with the firm-manufacturer name (at each firm it the) and a number of figures - change number, number экструдера (devices for manufacture of PVC-PROFILES) and manufacturing date. HOUSE NOTEBOOK Do not trust blindly to advertising or recommendations of acquaintances. Learn all about the company where you are going to make the order. Namely: Whether for a long time she is engaged in this kind of activity; Whether itself makes windows or is the dealer; Whether there is at firm-dealer an official contract with the manufacturer; What guarantee give - it should be at least for a year. If during this term the profile cracks, will turn yellow, will warp, etc., make a complaint to the firm which has given out a guarantee. Besides, will check up not harmfully presence of corresponding certificates on all making windows guaranteeing quality and suitability of application in the Russian climatic conditions.
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