Solar energy is always worthwhile, controlled ventilation makes a stiff neck, in the low-energy house one must never open windows. What is right, what is wrong?
Myth 1: In the low-energy house you are not allowed to open any windows
Wrong, that was true for the first passive houses. But these times are long gone. In modern low-energy houses, you can easily open the windows. But what is true: Many new buildings have a ventilation system today. It eliminates the need to open the windows for airing. If you do it anyway, the valuable heat escapes in cold months, but thanks to the heating system – no matter whether it’s regenerative or fossil – the desired room temperature can be quickly reached again.
Myth 2: Triple glazed windows are three times as dense as single glazed ones
They are even better, about twelve times better insulating! The heat permeability of windows is expressed as Ug value. Single glass has a Ug value of approx. 6 kWh / m²K, a triple glass of almost 0.5 kWh / m²K! In addition, a triple thermal insulation glazing makes rooms even more comfortable. Even with severe frost, the internal surface temperature is often more than 16 degrees Celsius.
Myth 3: In homes with ventilation you quickly get a stiff neck
The ventilation systems in low-energy houses are silent and draft-free. To achieve this, the airspeed is below 0.1 meters per second, which experts regard as calm, but The air can still circulate. However, to achieve this low value, the equipment must be set correctly. And do not worry – the inlet and outlet openings are not looking too bad either. Additionally, you can also set discreet smoke detectors along with the ventilation system.
Myth 4: The denser the house, the better mould thrives
This applies to old buildings with poorly insulated exterior walls, and that is when not enough air is released. In well-insulated houses, the outside walls are warm on the inside, so humidity cannot be deposited on the wall and thus become a breeding ground for mould fungi. In houses with a ventilation system, a mould is no longer an issue anyway since humidity is permanently dissipated.
Myth 5: The technology in energy efficient houses is totally clever – it regulates everything automatically
At least that’s the promise. In fact, even installers often struggle for months with the complexity of the control electronics. Builders should be called to have some words with the customers to check the liberty of their home automation system. It is reassuring if automated systems can also be controlled manually in an emergency.
Myth 6: Renewable energies make a good conscience, but cost many times
That may be, and final efficiency calculations are only possible on an individual basis. However, there are still serious calculations, according to which a pellet heater after 10 years, a solar thermal system after just under 20 years and a heat pump has paid off for over 10 years. One thing is for sure: With good insulation and the use of renewable heating systems, you can reduce your energy consumption enormously in the long term. This not only saves thousands of dollar in oil, gas and electricity but also benefits the environment from the very first moment.
Myth 7: Heat pumps generate heat just as well as conventional burners – only much more ecological
How warm it gets at home, especially the insulation of the building envelope and the tightness of the windows decide. An air source for the heat pump that feeds low-temperature underfloor heating will never warm an old building with open spaces to the roof. The energy consultant and architect will calculate which burner with which radiators or areas are most suitable and thus the most environmentally friendly, in aid with the heating installer.
Myth 8: Energy-saving lamps save the most
Anyone who thought that conventional energy-saving lamps cut the electricity bill the most is wrong. Although they are more frugal than previous light bulbs and halogen spotlights, modern LED lamps save even more energy. For example, an LED lamp that has the same light output as a 35-watt halogen spot consumes only 3 watts. So you can even save energy by building an energy efficiency house. But be careful: Be sure to use warm white light with a colour temperature of 2,700 Kelvin, so you will not notice a quality difference when you turn it on.
Myth 9: Energy-saving measures only make sense for new buildings
Even this rumour is not true. Unsatiated old buildings can save up to 90 percent. Subsequent insulation, modern thermal insulation glazing or the installation of a new heating system are not only worthwhile because of the lower energy costs. The measures also improve living comfort and increase the value of the property. In order for the financial burden to be borne, there are low-interest loans from some banks for energy-efficient refurbishment.
Warning: If you intend to turn your old building into an energy saving house, you should consult it with an expert first. This way, you’ll know whether or not the material used in your house is made of asbestos. So, call asbestos testing Sydney and always take a safe way to do it before you start ripping off your asbestos wall. So, save the energy and avoid being in contact with the deadly asbestos at all cost. As long as you follow the right protocol, you’ll be fine.