Changes in humidity can be a contributing factor to wood floors potentially swelling, shrinking, cupping or gapping between boards.
Using a dehumidifier or similar helps to achieve a consistent humidity level; but aim for an average relative humidity of around 40-70% and an average indoor temperature between 18-25 degrees celsius. Your indoor average shouldn't exceed 35 degrees celsius. So while heating your home may feel great, remember to keep the temperature at a moderate level to prevent damage to your flooring.
Wipe up spills and/or puddles from wet shoes immediately. Have a damp cloth tucked away for a quick clean-up. Remove wet shoes and make use of walk off mats in the entryways of your home.
Regular cleaning of your floor with appropriate product (as per your flooring finish) can help to make your floor more resistant to outside elements. Oiled floors with a fresh clean, look better over time and have a fresh layer of protection.
Images: Project - Smith Construction Bream Tail House, Mangawhai , Timothy Buck