When painting outside, it is always best to check the tin for the minimum/maximum temperatures. You must also take into account chill factors, especially on metal, as this can reduce surface temperatures considerably. From a health and safety perspective, there isn't a specific minimum or maximum temperature for a worker to paint in. Dress appropriately and stay ventilated/hydrated.
#1 You should pay attention to preparing the surfaces first making sure repairs take place prior to painting. It's not the fun part of the task, rather it's the most important part of painting. If you fail to prepare the surface, no matter how exclusive painting material you're using, it'll fail. Make sure there is no peeling paint left on wood and use the proper caulk for cracks along the trimwork and other small holes.
Give your fireplace mantle an accent paint color, as this adds a quick update without having to tear anything out. In the kitchen, give your cabinets a new look with a douse of kitchen cabinet paint for an affordable and satisfying update. Countertop paint makes kitchen countertops look new again. You can do it yourself with a countertop paint kit in less than a weekend. A worn-out bathtub can look new with a coating of bathtub paint. Even your tiles can get a refresh or touch up, try tile paint on your backsplash or shower. Pro-tip: Use semi-gloss paint for kitchens and bathrooms as they wipe down easily.