Input the air temperature and the relative humidity to calculate the dew point.
Inside a home, for optimum health and comfort, values between 40% and 50% are considered to be ideal.
As values creep above 60% action should be taken to ventilate, heat or dehumidify the air.
Significantly higher values become uncomfortable and unhealthy plus condensation will occur on colder surfaces that may feed mould growth.
If a surface inside your home is at or below the dew point temperature, condensation will start to occur on that surface. The greater the difference between the surface temperature and dew point, the faster condensation will build. On a porous surface such as wallpaper or an emulsioned wall the moisture will be absorbed and will not be obvious – however, mould spores will start to grow.
We recommend the use of inexpensive measuring tools to help monitor indoor air quality. These are freely available online – the links are below.
For measuring the surface temperature of walls and windows where condensation occurs: URCERI IR-802 Digital Laser IR Infrared Thermometer Non Contact High Temperature Gun Instant Read
Two golden rules to follow when buying or using a dehumidifier:
- Cheap models are less efficient. They will be costly to run and probably not achieve the result you expect. We recommend Meaco Home Dehumidifiers
- Dehumidifiers should not be switched off. Leave on 24/7, they automatically measure humidity and will switch on when required.
(Note: We do not receive remuneration from any of the products/companies recommended above, we simply recommend through personal ownership and use of the products)