greentomatoenergy designs low energy buildings, conducts energy surveys and installs solar panels. Our services also include: working for a clean energy future, about us, frequently asked questions, generate, save energy, build, Work with us, privacy, Solar case studies, contact us, your home, your business, your community, large scale developments, installers, values, environmental policy, environment, credentials, greentomatogroup, press, solar thermal, solar pv, wind energy, air source heat pumps, ground source heat pumps, consultancy, ventilation and heat recovery, insulation, windows, money matters, water, new build, what is passivhaus?, retrofit, techy stuff, is solar thermal for you?, money matters, why greentomatoenergy, techy stuff, is solar pv for you?, is an air source heat pump for you?, techy stuff, why greentomatoenergy?, money matters, money matters, why greentomatoenergy?, techy stuff, Is a ground source heat pump for you?, why greentomatoenergy?, techy stuff, is consultancy right for you?, why greentomatoenergy?, techy stuff, is mvhr right for you?, why greentomatoenergy?, techy stuff, is insulation right for you?, why greentomatoenergy?, techy stuff, is double-glazing for you?, why greentomatoenergy?, techy stuff, is water conservation for you?, feedback, solar pv questionnaire, solar thermal questionnaire, installers questionnaire, website terms & conditions, terms and conditions of sale, meet the team, consultancy case studies, greentomatocars brings free wifi to London, Win some LED lightbulbs

ventilation and heat recovery

heat recovery refers to the process of warming the cold air coming into a building with the warm air leaving it

heat recovery refers to the process of warming the cold air coming into a building with the warm air leaving it

Every house has some sort of ventilation, be it through leaky sash windows, cracks in Victorian plaster or active fans.  Without a doubt one of the most important steps in low energy building design is the ventilation strategy and greentomatoenergy has experience designing and installing passive and active ventilation systems. 

Once a house has been made airtight and all of the small holes allowing air to escape are closed off, it is possible to control the flow of air and install a mechanically ventilated heat recovery unit (“MVHR” to its friends) which captures heat from outgoing air and uses it to preheat air coming into the house.

What’s so great about draught proofing and heat recovery?

  • allows you to live in a much more comfortable environment - say goodbye to sitting next to draughty windows and doors
  • recovers up to 94% of the heat from the outgoing air
  • filters keep out pollen and other airborne nasties
  • reduces condensation and dampness
  • bad odours are whisked away - no more pongy bathrooms or kitchens
  • the system is so efficient that not only is the air in your building much fresher, but your building will stay much warmer too
  • saves money on your bills - 60% of energy bills are spent on heating your building
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Climate change is caused by increased solar activity, not humans.

Truth: The sun provides almost all the energy in... read more

Climate change is caused by increased solar activity, not humans.


Truth: The sun provides almost all the energy in the earth’s climate, so it clearly has a strong influence on the climate. Prior to 1960’s changes in solar activity and global climate were shown to be strongly proportional.

However, in the past 35 years, studies have shown solar activity to be diminishing, whilst the climate has shown a steady warming trend. This indicates that any recent change in global warming must be attributable to a different source. In fact, it is likely that a decline in solar activity is having a slowing (negative) effect on global temperature rise. Conversely, the warming trend over the past 35 years is directly proportional to recent rises in carbon dioxide emissions.

greentomatoenergy can help you with: working for a clean energy future, about us, frequently asked questions, generate, save energy, build, Work with us, privacy, Solar case studies, contact us, your home, your business, your community, large scale developments, installers, values, environmental policy, environment, credentials, greentomatogroup, press, solar thermal, solar pv, wind energy, air source heat pumps, ground source heat pumps, consultancy, ventilation and heat recovery, insulation, windows, money matters, water, new build, what is passivhaus?, retrofit, techy stuff, is solar thermal for you?, money matters, why greentomatoenergy, techy stuff, is solar pv for you?, is an air source heat pump for you?, techy stuff, why greentomatoenergy?, money matters, money matters, why greentomatoenergy?, techy stuff, Is a ground source heat pump for you?, why greentomatoenergy?, techy stuff, is consultancy right for you?, why greentomatoenergy?, techy stuff, is mvhr right for you?, why greentomatoenergy?, techy stuff, is insulation right for you?, why greentomatoenergy?, techy stuff, is double-glazing for you?, why greentomatoenergy?, techy stuff, is water conservation for you?, feedback, solar pv questionnaire, solar thermal questionnaire, installers questionnaire, website terms & conditions, terms and conditions of sale, meet the team, consultancy case studies, greentomatocars brings free wifi to London, Win some LED lightbulbs