The main objective of a physical map is to show landforms, bodies of water and other geographical features. Features shown include mountains, deserts and lowlands as well as lakes, rivers and oceans.
Depending on your electricity prices, a 400 watt HID will cost $200 â $400 each year of use, plus the cost of replacement bulbs. LEDs meant to replace 400w HIDs average around 180 watts.
For this situation, using average residential electricity costs, the monthly cost to run the HRV/ERV would be approximately $12. The average power draw of an HRV/ERV is 150 watts. If it runs 24 hours a day for 30 days each month, then the monthly energy consumption would be. 150 W Ã 24 hrs./day Ã 30 days/mo.