Drainage & water management Drainage and water management is a very important consideration in todays climate. Floor, roof and wall construction The best way to reduce our Carbon Emissions and increase energy efficiency is to improve the structural fabric of the build. Renewables Ground and Air Source Heat Pumps and Biomass Boilers are all available through the Howarth GreenHouse. Energy Saving Solar PV panels and Solar Thermal systems are just a couple of examples of how you can save energy. Heating and Ventilation The source of your heating is just as important as the way you distribute it. We offer a number of different heating options.